求教 GWD 的数学题

小货舱 · 发表于 2010-6-28 22:34:11

Q28:
Last Sunday a certainstore sold copies of Newspaper A for $1.00 each and copies of Newspaper Bfor $1.25 each, and the store sold no other newspapers that day. If r percent of the store’s revenuesfrom newspaper sales was from Newspaper A and if p percent of thenewspapers 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)

这道题目的答案是D
可是我算了8遍还是一个和答案差万里的表达式(40000-400p)/(p-400)
晕了都！
请清醒地各位同学指教

mecsid · 发表于 2010-6-28 23:11:32

算不出他给的答案。。。。。（1－p)/(1+0.25p)。。。。只好等待nn解释

holacraig · 发表于 2010-6-28 23:22:28

为什么我算出来的是(40000-400p)/(p+400)

小货舱 · 发表于 2010-6-29 09:28:31

看来答案一定有误，我们的结果还是比较like的

求教 GWD 的数学题

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