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标题: 请N N 们看看TTGWD-17-13吧! [打印本页]

作者: lanyuqi 时间: 2006-11-8 16:38
标题: 请N N 们看看TTGWD-17-13吧!

Q13:

Juan bought some paperback books that cost $8 each and some hardcover books that cost $25 each. If Juan bought more than 10 paperback books, how many hardcover books did he buy?

(1) The total cost of the hardcover books that Juan bought was at least $150.

(2) The total cost of all the books that Juan bought was less than $260.

A. Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.

B. Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.

C. BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

D. EACH statement ALONE is sufficient.

E. Statements (1) and (2) TOGETHER are NOT sufficient.

作者: kennycatter 时间: 2006-11-8 20:15
答案多少？是不是C啊?hardcover books 6 本。因为 paperback books 至少11本,如果hardcover books 7 本的话加起来就超过260了

作者: Nolayang 时间: 2006-11-8 22:25

agree C

8P+25h<260 =>25h<260-88=6.9 cos p>10,so suppose p=11

25h>=150 =>h>=6

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