数学题求解。

smycz

Q28:
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)

泾渭不凡

哈哈哈~~~亲~~~你数学肿么又发这儿咯~~~哈哈

smycz

错了啊？那要发哪啊

泾渭不凡

错了啊？那要发哪啊

-- by 会员 smycz (2012/4/23 13:15:52)

咩哈哈哈哈~~~亲你太口爱咯~~~我还以为你故意发这儿呢。。。。。哈哈哈~~

数学发这儿啦~
http://forum.chasedream.com/GMAT_Math/list-1.html

单调唱

算了十几分钟也没算出来，搜了下论坛，题目有问题吧。见：http://forum.chasedream.com/GMAT_Math/thread-662597-1-1.html

qingaiyijiu

哈哈哈~~~亲~~~你数学肿么又发这儿咯~~~哈哈

angelhxl

我觉得答案要么错了，要么题目有问题吧：
设总数量为n，总收入为r；A表示报纸A的数量，B表示B的；则:B=np%, A=n(1-p%); r=A/[A+1.25B]=[100-p]/[100+0.25p]

MarcDeu

觉得题目有问题，算了半天都不对，找题目的意思R%=1-P%，即R=100-P。