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Re: Q#18 of GMATclub test 18 [#permalink]
02 Jan 2010, 17:03
This question does not state that all the employees of the company contribute to the charity fund but the OA is assuming it.
Bunuel, can you please clarify...
Thanks in advance!!
I don't think that's assumed. As in OE: divide employees into three groups: X contribute less than 4, C<4 (this includes those employees who do not contribute at all); Y 4<=C<5, at leas 4 but less than 5; Z 5<=C, at least 5.
Note these groups don't have intersections. X+Y+Z=100 and given Y+Z=25. Z=?