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题库 / Prep2007E2-DS-17
Store S sold a total of 90 copies of a certain book during the seven days of last week, and it sold different numbers of copies on any two of the days. If for the seven days Store S sold the greatest number of copies on Saturday and the second greatest number of copies on Friday, did Store S sell more than 11 copies on Friday?
(1) Last week Store S sold 8 copies of the book on Thursday.
(2) Last week Store S sold 38 copies of the book on Saturday.
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.
设周i卖出的数量分别为Xi(i=1、2。。。6、7）
X1+X2+X3+X4+X5+X6+X7=90
其中X6最大，X5第二大，每个数都不相等。
所以由条件二X6=38得：
X1+X2+X3+X4+X5+X7＝90-38＝52
假设X5等于11，那么其他5个数最大只能是10、9、8、7、6
6+7+8+9+10+11＝5111
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