【OG20-P291-434题】A certain bookcase has 2 shelves of books. On the _OG16

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【OG20-P291-434题】

A certain bookcase has 2 shelves of books. On the upper shelf, the book with the greatest number of pages has 400 pages. Onthe lower shelf, the book with the least number of pages has 475 pages. What is the median number of pages for all of the books on the 2 shelves?

(1) There are 25 books on the upper shelf.

(2) There are 24 books on the lower shelf.

A

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

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

BOTH statement TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
分析C选项
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D

EACH statement ALONE is sufficient.
分析D选项
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E

Statements (1) and (2) TOGETHER are NOT sufficient.
分析E选项
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当前版本由小小饿了更新于2016-01-10 16:42:48 感谢由小小饿了对此题目的解答所做出的贡献。

已知条件是上面那个书架里面的书的页数最多为400页，下面那个书架里面书的页数最少为475页。如果排序的话，肯定是上面的书架都在前，下面的书架都在都在后面。但是具体里面的书怎么排我们不知道。条件一和条件二单独看都判断不出，合起来是，我们可以发现，最中间的那本刚好是在上面书架里的页数最大的那本，即，第25本是400页（后面那本第26本必然有475页）。第25本书前面有24本，后面有24本，所以400就是他们的中位数

题目讨论（3条评论）

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emily666

Given both (1) and (2), it follows that there is a total of 49 books. Therefore, the median will be the 25th book when the books are ordered by number of pages. Since the 25th book in this ordering is the book on the upper shelf with the greatest number of pages, the median is 400. Therefore, (1) and (2) together are sufficient.

0 0 回复 2020-05-12 19:33:23
Gika

可是又不知道上面和下面书的页数分布

0 0 回复 2019-09-28 23:30:08
杨机智

好奇怪的题，也没说怎么排序呀

0 0 回复 2019-09-22 20:45:45