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Q21:
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.
题目如上,答案是E
我是这样想的:
一共是25*27=675个座位
前面20空10*20=200
后面15空15*20=300
总共空了500个位置,其中第10-20这10排重复计算
因此用675+10*27-500=445个位置被坐满
因此我选了C
请教大家我这个思路有问题吗? |
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