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标题: og-ds-89 [打印本页]

作者: :-Dの 时间: 2010-3-19 17:33 标题: og-ds-89

89. Is the number of members of Club X greater than the
number of members of Club Y ?
(1) Of the members of Club X, 20 percent are also
members of Club Y.
(2) Of the members of Club Y, 30 percent are also
members of Club X.

答案是C

作者: pinksky 时间: 2010-3-22 13:40

条件1和条件2单独都不充分。这个应该很明显。我就不解释了。
当条件1和条件2联立时，可以得到30%Y=20%X。化简得，X/Y=3:2，所以X>Y。所以选C。

作者: bigpig 时间: 2010-3-22 13:55

rp好呀

作者: :-Dの 时间: 2010-3-23 11:26

恩，感谢一下

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