DS书学-PREP题讨教

chloeyeah21 · 发表于 2011-2-7 22:49:40

PREP有这样一道题：
At least 100 students at a certain high school study Japanese. If 4 percent of the students at the school who study French also study Japanese, do more students at the school study French than Japanese?
(1) 16 students at the school study both French and Japanese.

(2) 10 percent of the students at the school who study Japanese also study French.
（解释中列了一个表格）
設study French & study JP 人數為a
設沒有study French & study JP 人數為b
設study French & 沒有study JP 人數為c
設沒有study French & 沒有study JP 人數為d

解释中有这么一个式子4/100（a+c）=a
10/100(a+c)=a
请问这是怎么得来的？
若按题意，4%的学法语的同时也学日语，那不是直接4%*a不就行了吗？

elaine2011 · 发表于 2011-2-7 23:06:36

看不懂解释。选b么？

tangguo11 · 发表于 2011-2-8 14:40:15

我觉得这样，

画韦恩图，可见
（1）4%F=16，则F>J
（2）10%J=4%F, 则F>J

选D

chasingM7 · 发表于 2011-2-8 17:26:45

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DS书学-PREP题讨教

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