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题库 / Prep2007E2-DS-141
Of the 20 people who each purchased 2 tickets to a concert, some used both tickets, some used only 1 ticket, and some used neither ticket. What percent of the tickets that were purchased by the 20 people were used by those people?
(1) Of the 20 people, 10 used only 1 ticket.
(2) Of the 20 people, 4 used neither ticket.
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.
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题目没看清，问的是所有买的票的使用比例也就是40张票，多少张是用了的。1张没用，用了1张，用了2张的数量都知道才行。
20个人买票，一个人买了2张，一共是40张；有的人用了1张，有的人用了2张，有的人一张都没用；问用的票占买的票的比例；
1-10个人用了一张；
2-4个人一张都没用；
只有1+2才能知道到底用了多少张出去，才能算最后的比例