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.
这种题的思路：只存在喜欢和不喜欢，不存在第三种情况，例如：2/3的学生不喜欢LB，那就有1/3的学生喜欢LB。一共存在4种学生：喜欢LB和喜欢BS，喜欢LB和不喜欢BS，不喜欢LB和喜欢BS，不喜欢LB和不喜欢BS。题目要求不喜欢LB和喜欢BS
哈喽 小晓 又见面了额
哈哈哈这是我之前刷题做的笔记😂
登录 或 注册 后可以参加讨论