扫描二维码，直接登录
题库 / Prep2007E1-DS-2
Of the students who eat in a certain cafeteria, each student either likes or dislikes lima beans and each student either likes or dislikes brussels sprouts. Of these students, ~$\frac{2}{3}$~dislike lima beans; and of those who dislike lima beans, ~$\frac{3}{5}$~also dislike brussels sprouts. How many of the students like brussels sprouts but dislike lima beans?
(1) 120 students eat in the cafeteria.
(2) 40 of the students like lima beans.
Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
EACH statement ALONE is sufficient.
Statements (1) and (2) TOGETHER are NOT sufficient.
只存在喜欢和不喜欢，不存在第三种情况.是计算的关键。题目中的人群可以分为两个都喜欢 ，只喜欢一个（一种各一个），以及两个都不喜欢。花四分图就可以根据AB条件计算出。
B选项不过是用1/3先倒算出120人而已
登录 或 注册 后可以参加讨论