GMATPre数学请教1

yifengjingyus

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 are 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.
Key: B only (2) is sufficient

Please advise, thank you so much!

windlake

条件1，不满足问题。

条件2，学习日语同时学习法语的人数＝10％学日语人数。

题目中给出的条件：学习法语同时学习日语的人数＝4％法语人数

10％学日语人数＝4％学法语人数

学法语人数＝100×5/2＝250

学法语比学日语多：250－100＝150

条件2单独能满足问题，B

yifengjingyus

谢谢NN的解答，茅塞顿开呀！
但是有了个新的疑问，题中说学日语的人数至少100人，也可能是200 人呢？不知道怎么能推出具体多多少人？
anyway, 4%F=10%J, F/J>1已经可以说明了
多谢了....