数学题求解帮帮我吧

guo573874201 · 发表于 2011-10-9 01:20:54

[attachimg=345,215]91369[/attachimg]答案选C 是怎么算的呢为什么不是E呢

[attachimg=376,238]91370[/attachimg]答案选D 怎么算的呢

suyan312 · 发表于 2011-10-9 06:11:59

#1. Assume the member of Com. X is x, Com Y -y, then 25.7x +29.3Y=26.6 (x+y) => 2.7y=.9x therefore x >y.

suyan312 · 发表于 2011-10-9 06:18:55

Increased price of X is 1.1 x; reduced price of Y is .9y. what we need to know is .9Y/1.1x? <=> we need to know the ratio of y to x
(1) 1.1x=y -good
(20 .1x = 10/11 * .1 Y - good

Either (1) or (2) can help you to get y/x

hope this helps.

guo573874201 · 发表于 2011-10-10 00:38:12

你好题里不是说 original price X 吗是不是应该 0.9Y/X 呢为什么是0.9Y/1.1X呢请指教

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