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# Q#18 of GMATclub test 18

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Manager
Joined: 05 Dec 2009
Posts: 126
Followers: 2

Kudos [?]: 87 [0], given: 0

Q#18 of GMATclub test 18 [#permalink]

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02 Jan 2010, 16:19
00:00

Difficulty:

(N/A)

Question Stats:

100% (04:07) correct 0% (00:00) wrong based on 1 sessions

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This question does not state that all the employees of the company contribute to the charity fund but the OA is assuming it.

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Math Expert
Joined: 02 Sep 2009
Posts: 38864
Followers: 7729

Kudos [?]: 106085 [0], given: 11607

Re: Q#18 of GMATclub test 18 [#permalink]

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02 Jan 2010, 18:03
xyztroy wrote:
This question does not state that all the employees of the company contribute to the charity fund but the OA is assuming it.

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=?

(1) Y=20 --> Y+Z=20+Z=25 --> Z=5. Sufficient.

(2) X+Y=95 --> X+Y+Z=90+Z=100 --> Z=5. Sufficient.

Hope it's clear.
_________________
Re: Q#18 of GMATclub test 18   [#permalink] 02 Jan 2010, 18:03
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