求指教数学题

ivydaodao

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)

怎么算也算不出选项中的答案，望大神指教！

lhz910216

妹子~这道题有讨论过啊~
题目错了，第二个条件应该是newspaper A的p，你再做做看~是D吧

ivydaodao

lhz910216 发表于 2013-8-12 17:58
妹子~这道题有讨论过啊~
题目错了，第二个条件应该是newspaper A的p，你再做做看~是D吧 ...

谢谢啦~再问一下我怎么看这道题目有没有讨论过呢？

lhz910216

在CD的搜索里面输入题号啊，不如说GWD-3-Q13，不过这样搜出来的，大部分是verbal，当然也有数学，专门搜数学的话我也不会啊~~

唐诗小鱼

我今天早上做了。第二个条件就是newspaperA的。