问一道题

noella · 发表于 2011-8-14 15:08:36

Theater M has 25 rows with 27 seats in each row. How many of the seats were occupied during a certain show?
(1)   During the show, there was an average (arithmetic mean) of 10 unoccupied seats per row for the front 20 rows.
(2)   During the show, there was an average (arithmetic mean) of 20 unoccupied seats per row for the back 15 rows.

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.
为什么选E不选C?

leonjhz · 发表于 2011-8-14 15:53:15

C怎么算啊，算不出啊。如果条件一是前10，条件二是后15这样还差不多。条件一里面是前20，没办法算啊。

问一道题

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