og-ds-89

:-Dの

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

pinksky

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。

bigpig

rp好呀

:-Dの

恩，感谢一下