GMAT数学高分快速突破模拟题疑难题（更新5）

1。Every student graduating from Burgerville College is either a 4-year student or a transfer student. If Burgerville is graduating an equal number of 4-year students and transfer students, what fraction of the students who graduate with honors are transfer students?

(1) Of the 700 transfer students graduating, 300 are graduating with honors.

(2) Fifty percent more transfer students than 4-year students are graduating with honors.

Answer: B

我的疑惑：

题干中说4-year stu和trans stu人数相等。可是为什么问题又问trans-stu的所占份数？那不是50%么？

还是我题意没有理解对呢？这道题该怎么考虑？

期待指点ing。。

2。At a restaurant, Luis left a tip for his waiter equal to 20 percent of his entire dinner check, including tax. What was the amount of the dinner check?

(1)THe sum of the dinner check and the tip was $16.

Answer:A

疑问：tax不用靠考虑么？

3.

Is the standard deviation of ages of students in class A greater than the standard deviation of the age of students in class B?

(1) The difference between the ages of any two students in class A is always more than 1 year.

(2) No Student in class B is more than 6 months older than any other student.

Answer: C

4。In a certain law firm there are five senior partners and five junior partners and all senior partners receive bonuses greater than those of the junior partner. Does senior partner Johnson receive the largest bonus of the lawyers at the firm?

(1) Johnson receives a bonus greater than twice the average bonus for all the senior partners.

(2) All partners receive some bonus, and Mr. Johnson receives five times the average given to all the partners.

Answer: B

发现自己这种average和standard deviation的题总是比较糊涂。。。

不知道有没有人可以帮帮我缕缕头绪。。

谢谢啦：）

5。 Joan had a total of $16.50 in her coin bank. How many quarters does she have?

(1) The bank contains only quarters and dimes.

(2) THere were 81 coins in the bank.

Answer: C

Q: What's "quater"? How to solve this problem then?

我是这样理解的

第一题问的是在graduate with honor的人中transfer stu占的比例 不是在总graduates中的比例哈。。所以必须知道在graduate with honor的人中transfer stu和4-year stu的比例关系才行

条件一 我们看不出有多少graduate with honor的人 也不知道4-year有多少是with hornor的 所以无解

第二题嘛 要求dinner check 而tax和tip是绑在一起的 除去那20% tax也就一块儿被去掉而只剩下dinner check了 别被绕进去了哈。。

不知道我说清楚了没有 表达不太好

1.因为条件(1)里不知道4-year students 里面有多少个graduating with honors.所以就得不出students graduating with honors的总数啊..就算不出它当中transfer students 的fraction..

条件(2)里,可以设4-year students和transfer students的数都为m.设4-year中honor的fraction为y,transfer中honor的fraction为x.那么mx-my/my=3/2.得出x=5/2y.那么题目最后的fraction为mx/(mx+m·2/5x）=5/7

啊.不晓得我说清楚没哟..

2.我也不明白..况了...

条件（2）里，我的理解是transfer stu比4-year stu多3/2。。那么如果如niceMM这样设的话，我的列式是x/(x+y)=x/(5x/3)=3/5。。答案怎么不一样。。

不过这样的话是B是肯定的。。就是想说如果是计算题。。越说越晕了~~

谢谢wlcxMM!

啊啊..我也晕了.我好像这方面的题也很恼火.

哎...希望到时RP爆发一下,让我头脑清醒点咯..

Good luck~

有没有牛人来解决下第一道题啊~~~

是啊。。。

还有剩下的三道题。。。

拜托各位了！！

up up!