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标题: 请教PREP一道题 [打印本页]

作者: Pythagoras 时间: 2011-7-30 06:18 标题: 请教PREP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.

给的答案是B，可是我觉得(1)也可是充分的，不知道我的逻辑有没有错，请各位指教。

作者: eeheaven 时间: 2011-7-31 20:31

A只能推出study french的人为400人，但因为at least 100 study japenese, so it can not tell which group is of bigger number...

作者: steinlala 时间: 2011-8-7 19:55

学法语的人数为F，学日语的J，都学的FJ
从已知可知，FJ/F=0.04

1）给出FJ人数，根据已知求出F=400，但是不知道J，无法比较
2）FJ/J=0.1，同已知比一下，则知道J/F=0.4，得J小于F

因此选B

作者: Pythagoras 时间: 2011-8-8 06:25

拜谢～

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