GWD里的一道PS 答案有问题？【还未解决呀!!!】

cutewen · 发表于 2010-5-11 13:09:17

Last Sunday a certain store sold copies of Newspaper A for $1.00 each and copies of Newspaper B for $1.25 each, and the store sold no other newspapers that day.If r percent of the store’s revenues from newspaper sales was from Newspaper A and if p percent of the newspapers that the store sold were copies of newspaper B, which of the following expresses r in terms of p?

A.100p / (125 – p)

B.150p / (250 – p)

C.300p / (375 – p)

D.400p / (500 – p)

E.500p / (625 – p)

Answer: D

我算的 r=400-4p/400+p

这道题被做了红色的标记不知道是答案有问题还是说答案有争议。

大家算的什么？如果是D 怎么算出来的呢？

cutewen · 发表于 2010-5-11 22:04:56

自己顶~

cutewen · 发表于 2010-5-12 16:02:20

~~~~~~~~~~~~~

mickleon · 发表于 2010-5-12 17:14:12

设A B 为分别卖的数量
r percent of the store’s revenues from newspaper sales was from Newspaper A --> r% = A/(A +1.25B)

p percent of the newspapers that the store sold were copies of newspaper B --> p% = B/(A+B)%

给AB随便设两个数，比如A=100, B=100算，验证A-E哪个符合就是那个。

大概搜了一下，这题变体，把p%换成表示B的了，如果表示A的话，应该是选D。

GWD里的一道PS 答案有问题？【还未解决呀!!!】

所属分类: GMAT考试

正在浏览此版块的会员 ()

浏览过的版块