2007年1月math原始机经讨论稿第二篇完（48-99）1.19 18:13

olive_mm

1. A certain dealership sells three types of automobiles, cars, trucks, and vans. the ratio is 4:5:7. How may cars have the dealership sold?

1,  the number of van sold is between 10 and 20,

2,  the number of cars sold is less than 10.

the answer is the first one only.  I am pretty sure. (I agree, 1)--> car = 11, btw, is it "inclusively between 10 and 20,

or between 10 and 20? I am not sure whether 10 and 20 are included, otherwise choose E? )

2. one person have a fence, he uses the fence for a rectangle area, and the length is twice longer than the width.  if he uses the

fence for a square, the area will be 400 feet bigger.  how long is the fence.

1. 16

2. 40

3.160

4. 1200

5. 1600

my answer is 3 L=160feet

3. there is mug, what's the volume of the mug if it is a regular cylinder.

1. the inner circle has an arean of 6 inches.

2. the inner circle has a diameter of 4.

Answer is E, dont know the height of the mug. Btw, who can tell me : does volume mean 容积 or 体积？Thanks!

4. what's the order of these three numbers from the smallest to the largest

squre root of (0.0025),  squre root of (1/1600),  there is one more i can recall.

A>B

5. mary has 2000 dollars half is saved in a simple interest rate, and the other half is saved in semi-annual compound interest

rate of 8%. at the end of the year the interest earned from these savings accounts equal to each other. what is the simple

interest rate.

1. 8.16

2. 8.23

3. 8.25

4. 8.45

My answer is 8.16. 

[此贴子已经被作者于2007-1-8 8:19:51编辑过]

spring1206

    

52.
1/11+1/12+1/13+。。。+1/20问等于多少，选项有大于1/2，1/2，1/3等等~

    

1/11+1/12+1/13+。。。+1/20=0.668771>1/2

    

设1/11+1/12+1/13+。。。+1/20为x, 则10*(1/20)<
x < 10*(1/11)

    

=> 1/2
< x < 10/11

rio

以下是引用olive_mm在2007-1-8 8:18:00的发言：

1. A certain dealership sells three types of automobiles, cars, trucks, and vans. the ratio is 4:5:7. How may cars have the dealership sold?

1,  the number of van sold is between 10 and 20,

2,  the number of cars sold is less than 10.

the answer is the first one only.  I am pretty sure. (I agree, 1)--> car = 11, btw, is it "inclusively between 10 and 20,

or between 10 and 20? I am not sure whether 10 and 20 are included, otherwise choose E? )

2. one person have a fence, he uses the fence for a rectangle area, and the length is twice longer than the width.  if he uses the

fence for a square, the area will be 400 feet bigger.  how long is the fence.

1. 16

2. 40

3.160

4. 1200

5. 1600

my answer is 3 L=160feet

3. there is mug, what's the volume of the mug if it is a regular cylinder.

1. the inner circle has an arean of 6 inches.

2. the inner circle has a diameter of 4.

Answer is E, dont know the height of the mug. Btw, who can tell me : does volume mean 容积 or 体积？Thanks!

4. what's the order of these three numbers from the smallest to the largest

squre root of (0.0025),  squre root of (1/1600),  there is one more i can recall.

A>B

5. mary has 2000 dollars half is saved in a simple interest rate, and the other half is saved in semi-annual compound interest

rate of 8%. at the end of the year the interest earned from these savings accounts equal to each other. what is the simple

interest rate.

1. 8.16

2. 8.23

3. 8.25

4. 8.45

My answer is 8.16. 

 本月jj?

qiuping2006fr

以下是引用rio在2007-1-8 16:15:00的发言：

 本月jj?

yes, a person did GMAT in the US and posted the questions yesterday. The title: [原创]1/6 北美三战，终于700。 鼓励和机经

[此贴子已经被作者于2007-1-8 17:27:53编辑过]

rio

好 我先整理好 等原始稿有了题号我就贴上来

songren

 

[此贴子已经被作者于2007-1-8 21:33:50编辑过]

olive_mm

58. A certain dealership sells three types of automobiles, cars, trucks, and vans. the ratio is 4:5:7. How may cars have the dealership sold?

1, the number of van sold is between 10 and 20,

2, the number of cars sold is less than 10.

the answer is the first one only.  I am pretty sure. (I agree, 1)--> car = 11, btw, is it "inclusively between 10 and 20,

or between 10 and 20? I am not sure whether 10 and 20 are included, otherwise choose E? )

我认为，是不是inclusive没有影响

同意rio，我又看了一遍，觉得1推出的结果是car=8，rio是这样吧？

rio

以下是引用olive_mm在2007-1-8 22:58:00的发言：

58. A certain dealership sells three types of automobiles, cars, trucks, and vans. the ratio is 4:5:7. How may cars have the dealership sold?

1, the number of van sold is between 10 and 20,

2, the number of cars sold is less than 10.

the answer is the first one only.  I am pretty sure. (I agree, 1)--> car = 11, btw, is it "inclusively between 10 and 20,

or between 10 and 20? I am not sure whether 10 and 20 are included, otherwise choose E? )

我认为，是不是inclusive没有影响

同意rio，我又看了一遍，觉得1推出的结果是car=8，rio是这样吧？

同意

LS为什么叫mm?

wei_wangyan

请问rio，这些机经题目有没有固定的讨论贴？找了半天没找到。

下面这个题不会做：

53. x^2>y^2,问x>y? DS题，IXI>y, IyI<x

B，（1）无法得出结论，（2）可判断x<0，无论y是否大于0，y>x

多问一句，前面题目中有“待补充”的，就等着新机经出现后有相同题目时补充，是吗？谢谢。

wei_wangyan

59. one person has a fence, he uses the fence for a rectangle area, and the length is twice longer than the width.  if he uses the fence for a square, the area will be 400 feet bigger.  how long is the fence?

这用中文表达，就是长是宽的三倍了吧？

一开始当成两倍，算出个240，用三倍才能算出160。