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标题: [原创]GMATPrep 数学讨论题库汇总(II) [打印本页]
作者: cd小兵    时间: 2006-5-12 08:26
标题: [原创]GMATPrep 数学讨论题库汇总(II)

TIPS：快速查找问题的方法

用IE里的查找功能（在“编辑”菜单下面）就好了，以关键词搜索一下，就可以找到相关的题。

当然图片类的，大概浏览一下就可以了。

不要一道一道题的看过去.

相关连接：[原创]GMATPrep 数学讨论题库汇总（I）

http://forum.chasedream.com/dispbbs.asp?boardid=22&id=150752&star=1#150752

因（I）部分目前帖子太长，内容多，导致查询及速度慢，故新开此贴，续（I）。

260.

http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=171066&page=1

261. Malik’s recipe of 4 servings of a certain dish requires 3/2 cups of pasta. According to this recipe, what is the number of cups of pasta that Malik will use the next time he prepares this dish?

 

(1)   the next time he prepares this dish, Malik will make half as many servings as he did the last time he prepared the dish

(2)   Malik used 6 cuips of pasta the last time he prepared this dish

 

Choose C

262.The positive integers x, y and z are such that x is a factor of y and y is a factor of z. Is z even?

(1)   xy is even

(2)   y is even

choose D

263.On the number line, the distance between x and y is greater than the distance between x and z, does z lie between x and y on the number line?

(1)   xyz<0

(2)   xy<0

I choose C

E
             

http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=171065&page=1

http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=171065&page=1

http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=171065&page=1

http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=171065&page=1

http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=171065&page=1

http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=171065&page=1

http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=171065&page=1

http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=171065&page=1

http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=171065&page=1

http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=171065&page=1

264.

http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=171099&page=1

265。

http://forum.chasedream.com/dispbbs.asp?boardid=22&id=171327&star=1#1611232

266。

http://forum.chasedream.com/dispbbs.asp?boardid=22&id=171500&star=1#1614727

267。

 

267。 if n is a multiple of 5 and n= p2q, where p and q are prime numbers, which of the following must be a multiple of 25?
  

p2; q2 ; pq; p2q2; p3q

the answer is p2q2,

http://forum.chasedream.com/dispbbs.asp?boardid=22&id=171493&star=1#1614731

268。  5 people are to be seated around a circular table. Two seating arrangement are considered different only when the positions of the people are different relative to each other. What is the total number of different possible seating arrangements for the group?

 ANS: 24

 ANS: 24

 ANS: 24

 ANS: 24

 ANS: 24

 ANS: 24

 ANS: 24

 ANS: 24

 ANS: 24

 ANS: 24

 ANS: 24

 ANS: 24

 ANS: 24

 ANS: 24

 ANS: 24

 ANS: 24

 ANS: 24

 ANS: 24

 ANS: 24

 ANS: 24

 ANS: 24

 ANS: 24

 ANS: 24

 ANS: 24

 ANS: 24

 ANS: 24

 ANS: 24

DS:

269.  Is Z equal to the median of the 3 positive intergers X, Y, Z ?

     (1) X < Y + Z     (2) Y = Z

ANS: (B)

http://forum.chasedream.com/dispbbs.asp?boardid=22&id=171530&star=1#1614768

269。

 

http://forum.chasedream.com/dispbbs.asp?boardid=22&id=171617&star=1#1615473

270。

 

http://forum.chasedream.com/dispbbs.asp?boardid=22&id=171663&star=1#1615877

271。one kilogram of a certain coffee blend consists of X kilogram of type Ｉand Y kilogram of type ＩＩ. The cost of the blend is C dollars per kilogram, where C=6.5X+8.5Y. Is X<0.8?

(1)Y>0.15

(2)C>=7.30

答案为Ｂ．．．

(1)Y>0.15

(2)C>=7.30

答案为Ｂ．．．

(1)Y>0.15

(2)C>=7.30

答案为Ｂ．．．

(1)Y>0.15

(2)C>=7.30

答案为Ｂ．．．

(1)Y>0.15

(2)C>=7.30

答案为Ｂ．．．

(1)Y>0.15

(2)C>=7.30

答案为Ｂ．．．

(1)Y>0.15

(2)C>=7.30

答案为Ｂ．．．

(1)Y>0.15

(2)C>=7.30

答案为Ｂ．．．

(1)Y>0.15

(2)C>=7.30

答案为Ｂ．．．

(1)Y>0.15

(2)C>=7.30

答案为Ｂ．．．

(1)Y>0.15

(2)C>=7.30

答案为Ｂ．．．

(1)Y>0.15

(2)C>=7.30

答案为Ｂ．．．

(1)Y>0.15

(2)C>=7.30

答案为Ｂ．．．

(1)Y>0.15

(2)C>=7.30

答案为Ｂ．．．

(1)Y>0.15

(2)C>=7.30

答案为Ｂ．．．

(1)Y>0.15

(2)C>=7.30

答案为Ｂ．．．

(1)Y>0.15

(2)C>=7.30

答案为Ｂ．．．

(1)Y>0.15

(2)C>=7.30

答案为Ｂ．．．

(1)Y>0.15

(2)C>=7.30

答案为Ｂ．．．

(1)Y>0.15

(2)C>=7.30

答案为Ｂ．．．

(1)Y>0.15

(2)C>=7.30

答案为Ｂ．．．

(1)Y>0.15

(2)C>=7.30

答案为Ｂ．．．

(1)Y>0.15

(2)C>=7.30

答案为Ｂ．．．

(1)Y>0.15

(2)C>=7.30

答案为Ｂ．．．

http://forum.chasedream.com/dispbbs.asp?boardid=22&id=171713&star=1#1616830

272。

 

273。

http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=171819&page=1

274。20k可以被几个数整除?(1)K is prime (2)k=7

我选D，答案是B

275。问一个城市的超过65岁的工人是否超过10％

（1）超过65岁的人口是11％

（2）超过65岁再工作的人，男人有20％，女人有10％

我选D，答案是B

http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=172575&page=1

276。 r         s      t

on the number line shown, is zero halfway between r and s?

1)s is to the right of zero

2)the distance between t and r is the same as the distance between t and -s

r,s,t的大概位置是这样的，答案说是c，我怎么觉得b就可以了

on the number line shown, is zero halfway between r and s?

1)s is to the right of zero

2)the distance between t and r is the same as the distance between t and -s

r,s,t的大概位置是这样的，答案说是c，我怎么觉得b就可以了

on the number line shown, is zero halfway between r and s?

1)s is to the right of zero

2)the distance between t and r is the same as the distance between t and -s

r,s,t的大概位置是这样的，答案说是c，我怎么觉得b就可以了

on the number line shown, is zero halfway between r and s?

1)s is to the right of zero

2)the distance between t and r is the same as the distance between t and -s

r,s,t的大概位置是这样的，答案说是c，我怎么觉得b就可以了

on the number line shown, is zero halfway between r and s?

1)s is to the right of zero

2)the distance between t and r is the same as the distance between t and -s

r,s,t的大概位置是这样的，答案说是c，我怎么觉得b就可以了

on the number line shown, is zero halfway between r and s?

1)s is to the right of zero

2)the distance between t and r is the same as the distance between t and -s

r,s,t的大概位置是这样的，答案说是c，我怎么觉得b就可以了

on the number line shown, is zero halfway between r and s?

1)s is to the right of zero

2)the distance between t and r is the same as the distance between t and -s

r,s,t的大概位置是这样的，答案说是c，我怎么觉得b就可以了

on the number line shown, is zero halfway between r and s?

1)s is to the right of zero

2)the distance between t and r is the same as the distance between t and -s

r,s,t的大概位置是这样的，答案说是c，我怎么觉得b就可以了

on the number line shown, is zero halfway between r and s?

1)s is to the right of zero

2)the distance between t and r is the same as the distance between t and -s

r,s,t的大概位置是这样的，答案说是c，我怎么觉得b就可以了

on the number line shown, is zero halfway between r and s?

1)s is to the right of zero

2)the distance between t and r is the same as the distance between t and -s

r,s,t的大概位置是这样的，答案说是c，我怎么觉得b就可以了

on the number line shown, is zero halfway between r and s?

1)s is to the right of zero

2)the distance between t and r is the same as the distance between t and -s

r,s,t的大概位置是这样的，答案说是c，我怎么觉得b就可以了

on the number line shown, is zero halfway between r and s?

1)s is to the right of zero

2)the distance between t and r is the same as the distance between t and -s

r,s,t的大概位置是这样的，答案说是c，我怎么觉得b就可以了

on the number line shown, is zero halfway between r and s?

1)s is to the right of zero

2)the distance between t and r is the same as the distance between t and -s

r,s,t的大概位置是这样的，答案说是c，我怎么觉得b就可以了

on the number line shown, is zero halfway between r and s?

1)s is to the right of zero

2)the distance between t and r is the same as the distance between t and -s

r,s,t的大概位置是这样的，答案说是c，我怎么觉得b就可以了

on the number line shown, is zero halfway between r and s?

1)s is to the right of zero

2)the distance between t and r is the same as the distance between t and -s

r,s,t的大概位置是这样的，答案说是c，我怎么觉得b就可以了

on the number line shown, is zero halfway between r and s?

1)s is to the right of zero

2)the distance between t and r is the same as the distance between t and -s

r,s,t的大概位置是这样的，答案说是c，我怎么觉得b就可以了

on the number line shown, is zero halfway between r and s?

1)s is to the right of zero

2)the distance between t and r is the same as the distance between t and -s

r,s,t的大概位置是这样的，答案说是c，我怎么觉得b就可以了

on the number line shown, is zero halfway between r and s?

1)s is to the right of zero

2)the distance between t and r is the same as the distance between t and -s

r,s,t的大概位置是这样的，答案说是c，我怎么觉得b就可以了

on the number line shown, is zero halfway between r and s?

1)s is to the right of zero

2)the distance between t and r is the same as the distance between t and -s

r,s,t的大概位置是这样的，答案说是c，我怎么觉得b就可以了

http://forum.chasedream.com/dispbbs.asp?boardid=22&id=172549&star=1#1626630

277。

http://forum.chasedream.com/dispbbs.asp?boardid=22&id=172704&star=1#1627041

278。

http://forum.chasedream.com/dispbbs.asp?boardid=22&id=172723&star=1#1628137

279. 一个城市有132000人分到11个选区，没有哪个选区比别人多10%，问最少人数选区至少有几人？

答案为11100

280. X 为正数 X2（平方）<1/x<2x可能成立？

答案为可能，我认为不可能。

281. 如果m,r是数轴上的数，求r?

1 r 离0的距离是m离0的距离的3倍。

2 12 is halfway between m and r.

答案为E.C为何不可？

答案为11100

280. X 为正数 X2（平方）<1/x<2x可能成立？

答案为可能，我认为不可能。

281. 如果m,r是数轴上的数，求r?

1 r 离0的距离是m离0的距离的3倍。

2 12 is halfway between m and r.

答案为E.C为何不可？

答案为11100

280. X 为正数 X2（平方）<1/x<2x可能成立？

答案为可能，我认为不可能。

281. 如果m,r是数轴上的数，求r?

1 r 离0的距离是m离0的距离的3倍。

2 12 is halfway between m and r.

答案为E.C为何不可？

答案为11100

280. X 为正数 X2（平方）<1/x<2x可能成立？

答案为可能，我认为不可能。

281. 如果m,r是数轴上的数，求r?

1 r 离0的距离是m离0的距离的3倍。

2 12 is halfway between m and r.

答案为E.C为何不可？

答案为11100

280. X 为正数 X2（平方）<1/x<2x可能成立？

答案为可能，我认为不可能。

281. 如果m,r是数轴上的数，求r?

1 r 离0的距离是m离0的距离的3倍。

2 12 is halfway between m and r.

答案为E.C为何不可？

答案为11100

280. X 为正数 X2（平方）<1/x<2x可能成立？

答案为可能，我认为不可能。

281. 如果m,r是数轴上的数，求r?

1 r 离0的距离是m离0的距离的3倍。

2 12 is halfway between m and r.

答案为E.C为何不可？

答案为11100

280. X 为正数 X2（平方）<1/x<2x可能成立？

答案为可能，我认为不可能。

281. 如果m,r是数轴上的数，求r?

1 r 离0的距离是m离0的距离的3倍。

2 12 is halfway between m and r.

答案为E.C为何不可？

答案为11100

280. X 为正数 X2（平方）<1/x<2x可能成立？

答案为可能，我认为不可能。

281. 如果m,r是数轴上的数，求r?

1 r 离0的距离是m离0的距离的3倍。

2 12 is halfway between m and r.

答案为E.C为何不可？

答案为11100

280. X 为正数 X2（平方）<1/x<2x可能成立？

答案为可能，我认为不可能。

281. 如果m,r是数轴上的数，求r?

1 r 离0的距离是m离0的距离的3倍。

2 12 is halfway between m and r.

答案为E.C为何不可？

答案为11100

280. X 为正数 X2（平方）<1/x<2x可能成立？

答案为可能，我认为不可能。

281. 如果m,r是数轴上的数，求r?

1 r 离0的距离是m离0的距离的3倍。

2 12 is halfway between m and r.

答案为E.C为何不可？

答案为11100

280. X 为正数 X2（平方）<1/x<2x可能成立？

答案为可能，我认为不可能。

281. 如果m,r是数轴上的数，求r?

1 r 离0的距离是m离0的距离的3倍。

2 12 is halfway between m and r.

答案为E.C为何不可？

答案为11100

280. X 为正数 X2（平方）<1/x<2x可能成立？

答案为可能，我认为不可能。

281. 如果m,r是数轴上的数，求r?

1 r 离0的距离是m离0的距离的3倍。

2 12 is halfway between m and r.

答案为E.C为何不可？

答案为11100

280. X 为正数 X2（平方）<1/x<2x可能成立？

答案为可能，我认为不可能。

281. 如果m,r是数轴上的数，求r?

1 r 离0的距离是m离0的距离的3倍。

2 12 is halfway between m and r.

答案为E.C为何不可？

答案为11100

280. X 为正数 X2（平方）<1/x<2x可能成立？

答案为可能，我认为不可能。

281. 如果m,r是数轴上的数，求r?

1 r 离0的距离是m离0的距离的3倍。

2 12 is halfway between m and r.

答案为E.C为何不可？

答案为11100

280. X 为正数 X2（平方）<1/x<2x可能成立？

答案为可能，我认为不可能。

281. 如果m,r是数轴上的数，求r?

1 r 离0的距离是m离0的距离的3倍。

2 12 is halfway between m and r.

答案为E.C为何不可？

http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=172839&page=2

282.A hilker waliking at a constant rate of 4 miles per hour is passed by a cyclist traveling in the same direction along the same path at a constant rate of 20 miles per hour. THe cyclist stops to wait for the hiker 5 minutes after passing her, while the hilker continues to walk at the constant rate. How many minutes must the cyclist wait until the hilker catches up?

(A)6 2/3
(B)15
(C)20
(D)25
(E)26 2/3

http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=172897&page=2

283.is 1/p>r/(r^2+2) ?

(1) p=r

(2) r>0

key: C.

我求出来是E.

http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=172813&page=2

 

284.if 500 is the  multiple  of 100 that is closest to x,and 400 is the multiple of 100 that is closest to y, which multiple is 100 closest to x+y

1,x<500

2,y<400

http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=172971&page=2

285

284.if 500 is the  multiple  of 100 that is closest to x,and 400 is the multiple of 100 that is closest to y, which multiple is 100 closest to x+y

1,x<500

2,y<400

http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=172971&page=2

285

284.if 500 is the  multiple  of 100 that is closest to x,and 400 is the multiple of 100 that is closest to y, which multiple is 100 closest to x+y

1,x<500

2,y<400

http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=172971&page=2

285

284.if 500 is the  multiple  of 100 that is closest to x,and 400 is the multiple of 100 that is closest to y, which multiple is 100 closest to x+y

1,x<500

2,y<400

http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=172971&page=2

285

284.if 500 is the  multiple  of 100 that is closest to x,and 400 is the multiple of 100 that is closest to y, which multiple is 100 closest to x+y

1,x<500

2,y<400

http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=172971&page=2

285

284.if 500 is the  multiple  of 100 that is closest to x,and 400 is the multiple of 100 that is closest to y, which multiple is 100 closest to x+y

1,x<500

2,y<400

http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=172971&page=2

285

284.if 500 is the  multiple  of 100 that is closest to x,and 400 is the multiple of 100 that is closest to y, which multiple is 100 closest to x+y

1,x<500

2,y<400

http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=172971&page=2

285

284.if 500 is the  multiple  of 100 that is closest to x,and 400 is the multiple of 100 that is closest to y, which multiple is 100 closest to x+y

1,x<500

2,y<400

http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=172971&page=2

285

284.if 500 is the  multiple  of 100 that is closest to x,and 400 is the multiple of 100 that is closest to y, which multiple is 100 closest to x+y

1,x<500

2,y<400

http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=172971&page=2

285

284.if 500 is the  multiple  of 100 that is closest to x,and 400 is the multiple of 100 that is closest to y, which multiple is 100 closest to x+y

1,x<500

2,y<400

http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=172971&page=2

285

284.if 500 is the  multiple  of 100 that is closest to x,and 400 is the multiple of 100 that is closest to y, which multiple is 100 closest to x+y

1,x<500

2,y<400

http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=172971&page=2

285

284.if 500 is the  multiple  of 100 that is closest to x,and 400 is the multiple of 100 that is closest to y, which multiple is 100 closest to x+y

1,x<500

2,y<400

http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=172971&page=2

285

http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=173114&page=1

286

http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=173214&page=1

287

288。IF k is a prime number, then 20K is divisible by how many different positive integers?

(1)k is prime

(2)k =7

answe is B

(1)k is prime

(2)k =7

answe is B

(1)k is prime

(2)k =7

answe is B

(1)k is prime

(2)k =7

answe is B

(1)k is prime

(2)k =7

answe is B

(1)k is prime

(2)k =7

answe is B

(1)k is prime

(2)k =7

answe is B

(1)k is prime

(2)k =7

answe is B

(1)k is prime

(2)k =7

answe is B

(1)k is prime

(2)k =7

answe is B

(1)k is prime

(2)k =7

answe is B

http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=173205&page=1

289

290。

http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=173312&page=2

291

292

http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=173315&page=2

293。

294。

http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=173313&page=2

295。

296。

http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=174000&page=1

297。

298。

http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=174047&page=1

299. What is the greatest prime factor of 4 ^17 - 2 ^ 28 ?

ans......7

300. In the xy-plane. link k has positive slop and x-intercept 4. If the area of the triangle

    formed by link k and the two axes is 12. What of the y- intercept of link?

   ans.......-6

301. IS the positive interger J divisible by a greater number of different prime numbers than

    the positive interger k ?

(1) j is divisible by 30

(2) k=1000

ans....(C)

302.

How much time did it take a certain car to travel 400 kilometers?

(1) The car traveled the first 200 kilometers in 2.5 hours

(2) If the car's average speed had been 20 kiolmeters per hour

     greater than it was, it would have traveled the 400 kilometers in 1 hours less time than

     it did.

ans.....(B)

http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=174358&page=1

303。 在平面坐标上有两条线L和K,它们的交点在(4,3),问两条直线斜率乘积是否为负

(1) 在X轴上的截距之乘积为正

(2)在Y轴上的截距之乘积为负

答案C

304. 有R个红球,W个白球,B个黑球,任意选一个,问选到是红球的概率大于选到是白球的概率吗?

(1) R/(B+W) >W/(B+R)

(2) 忘了(不过我知道不充分)

答案A

http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=175359&page=1

305. is the integer N odd?

(1) N is divisible by 3

(2) 2N is divisible by twice as many positive integers as N

答案是B 为什么？如何看出来？可以解释一下(2)的意思吗？

 

306. 大概意思是，两个水管一冷一热，冷的单独排满一个池要用c 小时，热的单独排满用h小时，一起排用t小时，c<h,问下面哪个一定对？

ⅰ. 0<t<h

ⅱ. c<t<h

ⅲ. c/2<t<h/2

答案选ⅰ.ⅲ. 不明白ⅲ怎样做出来

http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=176010&page=1

307.If the integers a and n are greater than 1 and the product fo the first 8 positive integers is a multiple of (a的n次方), what is the value of a?

1) （a的n次方) = 64

2)   n = 6

the answer is:  B) statement 2) alone is sufficient, statement 1) is not.

http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=176554&page=1

308. A certain bastket contains 10 apples , 7 of which are red and 3 of whcih are green. If 3 different apple are to be selected at random from the basket, what is the probability that 2 of the apples aelected will be red and 1 will be green?

答案是21/40

这道题应该不难，可是算不出答案, 这样想哪里有错吗, 先挑一个绿的, 概率是C(3,1)/C(10,1), 乘以红的C(7,2)/C(9,2), c

309. For Manufacturer M, the cost C of producing X Units of its product per month is given by c=kx+t, where c is in dollars and k and t are constants. Last month if Manufacturer M produced 1,000 units of its product and sold all the units for k+60 dollars each, what was Manufacturer M's gross profit on the 1,000 units?

1) Last month, Manufacturer M's revenue from the sale of the 1,000 units was 150,000

2) Manufacturer M's cost of producting 500 Units in a month is 45,000 less than its cost of producing 1,ooo units in a month

c=kx+t    last month cost=1000k+t     profit: 1000(k+60) -(1000k+t) =60000-t  ,

(1)150000=1000k+t     (2) (1000k+t)-(500k+t)=45000   得出k ,  由(1)得出t,  profit可以算出,c   可是答案是e,为什么?哪里不对?

答案是21/40

这道题应该不难，可是算不出答案, 这样想哪里有错吗, 先挑一个绿的, 概率是C(3,1)/C(10,1), 乘以红的C(7,2)/C(9,2), c

309. For Manufacturer M, the cost C of producing X Units of its product per month is given by c=kx+t, where c is in dollars and k and t are constants. Last month if Manufacturer M produced 1,000 units of its product and sold all the units for k+60 dollars each, what was Manufacturer M's gross profit on the 1,000 units?

1) Last month, Manufacturer M's revenue from the sale of the 1,000 units was 150,000

2) Manufacturer M's cost of producting 500 Units in a month is 45,000 less than its cost of producing 1,ooo units in a month

c=kx+t    last month cost=1000k+t     profit: 1000(k+60) -(1000k+t) =60000-t  ,

(1)150000=1000k+t     (2) (1000k+t)-(500k+t)=45000   得出k ,  由(1)得出t,  profit可以算出,c   可是答案是e,为什么?哪里不对?

答案是21/40

这道题应该不难，可是算不出答案, 这样想哪里有错吗, 先挑一个绿的, 概率是C(3,1)/C(10,1), 乘以红的C(7,2)/C(9,2), c

309. For Manufacturer M, the cost C of producing X Units of its product per month is given by c=kx+t, where c is in dollars and k and t are constants. Last month if Manufacturer M produced 1,000 units of its product and sold all the units for k+60 dollars each, what was Manufacturer M's gross profit on the 1,000 units?

1) Last month, Manufacturer M's revenue from the sale of the 1,000 units was 150,000

2) Manufacturer M's cost of producting 500 Units in a month is 45,000 less than its cost of producing 1,ooo units in a month

c=kx+t    last month cost=1000k+t     profit: 1000(k+60) -(1000k+t) =60000-t  ,

(1)150000=1000k+t     (2) (1000k+t)-(500k+t)=45000   得出k ,  由(1)得出t,  profit可以算出,c   可是答案是e,为什么?哪里不对?

答案是21/40

这道题应该不难，可是算不出答案, 这样想哪里有错吗, 先挑一个绿的, 概率是C(3,1)/C(10,1), 乘以红的C(7,2)/C(9,2), c

http://forum.chasedream.com/dispbbs.asp?boardid=22&id=176619&star=1#1670583

310。AT a dinner party,5 people are to be seated around a circular table,two seating arrangements are considered different only when the position of the people are different relative to each other.what is hte total number of different possible seating arrangements for the group?

the answer is 24, but I figure out it's 120?

http://forum.chasedream.com/dispbbs.asp?boardid=22&id=176988&star=1#1673947

311。on the line above,the segment from 0 to 1 has been divided in to fifths and also in to sevenths,what it the least possible distanve between any two of the tick marks?

这个题答案1/35=3/7-2/5

http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=177750&page=1

312。Is positive interger n divisible by 3?

(1) n2/36 is an interger

(2)144/n2 is an interger

the answer is A

(1) n2/36 is an interger

(2)144/n2 is an interger

the answer is A

http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=177751&page=1

313。Circle C and line k lie in the xy-plane.if circle c is centered at the origin and has radius1,does line k intersect circle c?

(1) the x-intercept of line k is greater than 1

(2) the slope of line k is -1/10

the answer is E, 这个题我是把直线方程 y=-1/10x+d 代入圆方程x2+y2=1,然后看b的条件范围，求出b2-4ac是否大于0，但是这样很花时间，有没有其他简便的做法？

http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=177752&page=1

更新于2006.6.21


作者: cd小兵    时间: 2006-5-12 08:27

314。For which of the following functions is f(a+b)=f(b)+f(a) for all positive numbers a and b?

A. f(x)=x^2

B. f(x)=x+1

C. f(x)=根号x

D. f(x)=2/x

E. f(x)=-3x

看不明白题目的思路。如何解题，请哪位提醒提醒为什么选e。谢谢。

http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=179146&page=1

315。When a certain tree was first planted, it was 4 feet tall, and the height of the tree increased by a constant amount each year for the next 6 years. At the end of the 6th year, the tree was 1/5 taller than it was at the end of the 4th year. By how many feet did the height of the tree increase each year?

answer: 2/3

what does it meant when it says "the tree was 1/5 taller than it was at the end of the 4th "?

http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=179155&page=1

316.Set S consists of five consecutive integers, and set T consists of seven consecutive integers. Is the median of the numbers in set S equal to the median of the numbers in set T?

(1)    The median of the numbers in set S is 0;

(2)    The sum of the numbers in set S is equal to the sum of the numbers in set T;

Answer: C

http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=179658&page=1

317.

http://forum.chasedream.com/dispbbs.asp?boardid=22&id=180301&star=1#1704286

318.

http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=180297&page=1

319.

http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=180485&page=1

320.

http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=180614&page=1

321.

http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=180626&page=1

322.

http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=180488&page=1

323.

http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=180480&page=1

324.问（4的17次方－2的28次方），它的最大质因数是多少？

答案是7。

由题意可以得到这个差值的个位是8，题目给出的答案中，只有2，和7符合这个结果。我考虑到2的次方之差的数，不太可能最大的质因数是2，所以就选了7，但没有严格推理。请NN给一下推理过程，谢谢^_^。

325. A store purchased 20 coats that each cost an equal amount and then sold each of the 20 coats at a equal price. What was the store's gross profit on 20 coats?

(1.) If the selling price per coat had been twice as much, the store's gross profit on the 20 coats would have been $2,400.

(2. )If the selling price per coat had been $2 more, the store's gross profit on the 20 coats would have been $440.

答案是B。我觉得1，2两个选项都直接给出gross profit了。汗，我应该是没看懂题，请大家帮忙。

答案是7。

由题意可以得到这个差值的个位是8，题目给出的答案中，只有2，和7符合这个结果。我考虑到2的次方之差的数，不太可能最大的质因数是2，所以就选了7，但没有严格推理。请NN给一下推理过程，谢谢^_^。

325. A store purchased 20 coats that each cost an equal amount and then sold each of the 20 coats at a equal price. What was the store's gross profit on 20 coats?

(1.) If the selling price per coat had been twice as much, the store's gross profit on the 20 coats would have been $2,400.

(2. )If the selling price per coat had been $2 more, the store's gross profit on the 20 coats would have been $440.

答案是B。我觉得1，2两个选项都直接给出gross profit了。汗，我应该是没看懂题，请大家帮忙。

答案是7。

由题意可以得到这个差值的个位是8，题目给出的答案中，只有2，和7符合这个结果。我考虑到2的次方之差的数，不太可能最大的质因数是2，所以就选了7，但没有严格推理。请NN给一下推理过程，谢谢^_^。

325. A store purchased 20 coats that each cost an equal amount and then sold each of the 20 coats at a equal price. What was the store's gross profit on 20 coats?

(1.) If the selling price per coat had been twice as much, the store's gross profit on the 20 coats would have been $2,400.

(2. )If the selling price per coat had been $2 more, the store's gross profit on the 20 coats would have been $440.

答案是B。我觉得1，2两个选项都直接给出gross profit了。汗，我应该是没看懂题，请大家帮忙。

答案是7。

由题意可以得到这个差值的个位是8，题目给出的答案中，只有2，和7符合这个结果。我考虑到2的次方之差的数，不太可能最大的质因数是2，所以就选了7，但没有严格推理。请NN给一下推理过程，谢谢^_^。

325. A store purchased 20 coats that each cost an equal amount and then sold each of the 20 coats at a equal price. What was the store's gross profit on 20 coats?

(1.) If the selling price per coat had been twice as much, the store's gross profit on the 20 coats would have been $2,400.

(2. )If the selling price per coat had been $2 more, the store's gross profit on the 20 coats would have been $440.

答案是B。我觉得1，2两个选项都直接给出gross profit了。汗，我应该是没看懂题，请大家帮忙。

http://forum.chasedream.com/dispbbs.asp?BoardID=22&replyID=1755732&id=186246&skin=0

326.If there are more than two numbers in certain list, is each of the numbers in the list equal to 0?

1) The product of any two numbers in the list equal to 0.

2) The sum of any two numbers in the list equal to 0.

Answer: B

1) The product of any two numbers in the list equal to 0.

2) The sum of any two numbers in the list equal to 0.

Answer: B

1) The product of any two numbers in the list equal to 0.

2) The sum of any two numbers in the list equal to 0.

Answer: B

1) The product of any two numbers in the list equal to 0.

2) The sum of any two numbers in the list equal to 0.

Answer: B

http://forum.chasedream.com/dispbbs.asp?BoardID=22&replyID=1752589&id=185953&skin=0

327. is XY>0?

          (1) X-Y>-2

          (2)X-2Y<-6

答案是 C, why?

http://forum.chasedream.com/dispbbs.asp?BoardID=22&replyID=1751162&id=185803&skin=0

328.

http://forum.chasedream.com/dispbbs.asp?BoardID=22&replyID=1719380&id=181967&skin=0

343.

http://forum.chasedream.com/dispbbs.asp?BoardID=22&replyID=1719309&id=181959&skin=0

344.

http://forum.chasedream.com/dispbbs.asp?BoardID=22&replyID=1719297&id=181955&skin=0

345.A company plans to assign identification numbers to its employees. Each number is to consist of four different digits from 0 to 9, inclusive, except that the first digit cannot be 0. How many different identification numbers are possible?
Answer: 4536
But I think, C(9,1)C(9,1)C(8,1)C(7,1).Where am I wrong?

http://forum.chasedream.com/dispbbs.asp?BoardID=22&replyID=1718799&id=181887&skin=0

346.three grades of millk are 1 percent, 2 percent, and 3 precent fat by volume. If X gallons of the 1 percent grade, Y gallons of the 2 percent grade, and Z gallons of the 3 percent grade are mixed to give X+Y+Z gallons of a 1.5 percent grade, which is X in terms of Y and Z?

(1) Y+3Z  ( this one is right)

(2) (Y+Z)/4

(3) 2Y+3Z

(4) 3Y+Z

(5) 3Y+4.5Z

thanks for help..really don't know how to do this one..

http://forum.chasedream.com/dispbbs.asp?BoardID=22&replyID=1715253&id=181454&skin=0

347.At a dinner party, 5 people are to be seated around a circular table. Two seating arrangements are considered different only when the positions of the people are different relative to each other. What is the total number of different possible seating arrangements for the group?

5

10

24

32

120

http://forum.chasedream.com/dispbbs.asp?BoardID=22&replyID=1712530&id=181125&skin=0

348.The arithmetic mean and standard deviation of a certain normal distribution are 13.5 and 1.5 respectively. What value is exactly 2 standard deviations less than the mean?

答案： 10.5

答案： 10.5

答案： 10.5

http://forum.chasedream.com/dispbbs.asp?BoardID=22&replyID=1711719&id=181043&skin=0

349。In the sequence shown, a(n)=a(n-1)+k, where 2<=n<=15 and k is a nonzero constant. How many of
the terms in the sequence are greater than 10?
1. a(1)=24
2. a(8)=10
B -- I think it's C

http://forum.chasedream.com/dispbbs.asp?BoardID=22&replyID=1710011&id=180823&skin=0

350.

351.

352.

http://forum.chasedream.com/dispbbs.asp?BoardID=22&replyID=1744382&id=185054&skin=0

353.

http://forum.chasedream.com/dispbbs.asp?BoardID=22&ID=182368&replyID=&skin=1

354.

http://forum.chasedream.com/dispbbs.asp?BoardID=22&ID=182367&replyID=&skin=1

355.To celebrate a colleague's retirement, the T coworkers in an office agreed to share equally the cost of a catered lunch. If the lunch costs a total of X dollars and S of the coworkers fail to pay their share, which of the following represents the additional amount, in dollars, that each of the remaining coworkers would have to contri bute so that the cost of the lunch is completely paid?

A. X/T    B. X/(T-S)   C. SX/(T-S)   D. SX/T(T-S)  E. X(T-S)/T

A. X/T    B. X/(T-S)   C. SX/(T-S)   D. SX/T(T-S)  E. X(T-S)/T

http://forum.chasedream.com/dispbbs.asp?BoardID=22&ID=182170&replyID=&skin=1

356.

http://forum.chasedream.com/dispbbs.asp?BoardID=22&ID=182031&replyID=&skin=1

357.

http://forum.chasedream.com/dispbbs.asp?BoardID=22&ID=182028&replyID=&skin=1

358.

http://forum.chasedream.com/dispbbs.asp?BoardID=22&ID=182026&replyID=&skin=1

359.

http://forum.chasedream.com/dispbbs.asp?BoardID=22&ID=182025&replyID=&skin=1

360.Did one one of the 3 members of a centain team sell at least 2 raffle tickets yesterday?

(1) the 3 members sold a total of 6 raffle tickets yesterday.

(2) No 2 of the members sold the same number of raffle tickets yesterday.

key is D...... why? i thought only one is sufficient, what does (2) mean?

361.How many different prime numbers are factors of the positive integer n?

(1) four different prime numbers are factors of 2n.

(2) four different prime numbers are factors of n^2.

Key is B, totally lost............. Meng ren pls Help...

(1) the 3 members sold a total of 6 raffle tickets yesterday.

(2) No 2 of the members sold the same number of raffle tickets yesterday.

key is D...... why? i thought only one is sufficient, what does (2) mean?

361.How many different prime numbers are factors of the positive integer n?

(1) four different prime numbers are factors of 2n.

(2) four different prime numbers are factors of n^2.

Key is B, totally lost............. Meng ren pls Help...

http://forum.chasedream.com/dispbbs.asp?BoardID=22&ID=181844&replyID=&skin=1

362.

http://forum.chasedream.com/dispbbs.asp?BoardID=22&ID=181135&replyID=&skin=1

363.

http://forum.chasedream.com/dispbbs.asp?BoardID=22&ID=181134&replyID=&skin=1

364.

http://forum.chasedream.com/dispbbs.asp?BoardID=22&ID=181133&replyID=&skin=1

365.

http://forum.chasedream.com/dispbbs.asp?BoardID=22&ID=181130&replyID=&skin=1

366.

http://forum.chasedream.com/dispbbs.asp?BoardID=22&ID=181129&replyID=&skin=1

367.

http://forum.chasedream.com/dispbbs.asp?BoardID=22&ID=181128&replyID=&skin=1

368.The rate of a certain chemical reaction is directly proportional to the square of the concentration of chemical A present and inversely proportional to the concentration of the chemical B present . If the concentration of chemical B is increased by 100 persent, which of the following is closest to the percent change in the concentration of chemical of A required to keep the reaction rate unchanged?

A 100% increase

B 50% decrease

C 40% decrease

D 40 % increase

E 50% increase

A 100% increase

B 50% decrease

C 40% decrease

D 40 % increase

E 50% increase

http://forum.chasedream.com/dispbbs.asp?BoardID=22&ID=181110&replyID=&skin=1

369.

http://forum.chasedream.com/dispbbs.asp?BoardID=22&ID=180882&replyID=&skin=1

370.

http://forum.chasedream.com/dispbbs.asp?BoardID=22&ID=180880&replyID=&skin=1

371.

http://forum.chasedream.com/dispbbs.asp?BoardID=22&ID=180877&replyID=&skin=1

最新更新：2006.8.8






[此贴子已经被作者于2006-8-8 15:27:24编辑过]
作者: cd小兵    时间: 2006-5-12 08:27
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作者: cd小兵    时间: 2006-5-12 08:27
占
作者: cd小兵    时间: 2006-5-12 08:28
占
作者: cd小兵    时间: 2006-5-12 08:28
占
作者: 数学语文    时间: 2006-8-3 23:32

最近复习数学，先就看了楼上各位的问题以及解答，很有启发，谢谢！

作者: 数学语文    时间: 2006-8-18 18:43

gmatprep题目求解

Are x and y both positive?

(1)2x-2y=1

(2)x/y>1

谢谢！

作者: 数学语文    时间: 2006-8-22 17:40

没有人理？

作者: xueyumumu    时间: 2006-8-22 18:00

我这人笨一点，给个解，你看行不?

because X/Y>1,so that

1>.X>0,Y>0.andX>Y

2>.X<0,Y<0,andX>Y.

but for2X-2Y>1,so X>Y,

if the both 2X-2Y>1andX/Y>0 are right.then,only the condition 1> is right,

so that,both X and Y are all positive.

作者: xueyumumu    时间: 2006-8-22 18:02

2>写错了，

是2>，X<0，Y<0，and X<Y,

so sorry!

作者: xueyumumu    时间: 2006-8-22 18:06

不好意思2>写错了

2>，X<0，Y<0，and X<Y

so sorry!

作者: 獭獭    时间: 2006-9-15 16:45
为什么一道题会有好多重复阿？
作者: 莫依    时间: 2007-7-4 19:20
图看不清啊……
作者: miaoyu2    时间: 2008-9-12 12:31
图看不清啊……
作者: juidy7433    时间: 2008-11-20 00:08

27.    3330-!-item-!-187;#058&003295

38, 69, 22, 73, 31, 47, 13, 82

Which of the following numbers is greater than three-fourths of the numbers but less than one-fourth of the numbers in the list above?

 

(A) 56

(B) 68

(C) 69

(D) 71

(E) 73

     請問一下 可以教我解這題ㄇ

作者: amu7835    时间: 2008-11-20 09:27

27.    3330-!-item-!-187;#058&003295

38, 69, 22, 73, 31, 47, 13, 82

Which of the following numbers is greater than three-fourths of the numbers but less than one-fourth of the numbers in the list above?

解答：这题排序就好了，13，22，31，38，47，69，73，82；

大于其中3/4,就是大于前6个数，小于1/4,就是小于前两个数，那就是69到73之间，所以选D，71

作者: wuminfeijiao    时间: 2009-6-9 16:52
以下是引用xueyumumu在2006-8-22 18:00:00的发言：

我这人笨一点，给个解，你看行不?

because X/Y>1,so that

1>.X>0,Y>0.andX>Y

2>.X<0,Y<0,andX>Y.

but for2X-2Y>1,so X>Y,

if the both 2X-2Y>1andX/Y>0 are right.then,only the condition 1> is right,

so that,both X and Y are all positive.

我也来一个思路 条件一 可以得出 x,y为正且x>y，或者x正y负且x<y

条件二可以得出xy同号且x>y

综合一二可以得出xy为正

作者: flonacui    时间: 2012-11-12 21:20
图片不存在？？
作者: Constantine716    时间: 2022-1-15 00:57
cd小兵 发表于 2006-5-12 08:27
314。For which of the following functions is f(a+b)=f(b)+f(a) for all positive numbers a and b?A. f( ...

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