GWD7-21

evelyn205205 · 发表于 2011-2-10 10:59:28

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.
此题答案选的是E。
为何两者的结合不可以使结论成立呢？

kazemi · 发表于 2011-2-10 11:29:45

http://www.urch.com/forums/gmat-data-sufficiency/86905-ds-problems.html

evelyn205205 · 发表于 2011-2-10 14:23:32

你们的信息来源好多啊

GWD7-21

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