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# This one is from the OG - I read thru the explanation, but

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Joined: 13 Sep 2006
Posts: 198
Schools: Olin Business School - Washington University
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This one is from the OG - I read thru the explanation, but [#permalink]  14 Sep 2006, 19:45
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This one is from the OG - I read thru the explanation, but still cant seem to figure out why the OA is correct...can someone explain?

The ratio, by volume, of soap to alcohol to water in certain solution is 2:50:100. The solution will be altered so that the ratio of soap to alchol is doubled while the ratio of soap to water is halved. If the altered solution will contain 100 cubic centimeters of alcohol, how many cubic centimeters of water will it contain?

A 50
B 200
C 400
D 625
E 800
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Joined: 23 Jun 2005
Posts: 847
GMAT 1: 740 Q48 V42
Followers: 5

Kudos [?]: 31 [0], given: 1

Ans E
2:50:100::S:A:W
S:A = doubled, so 2:25
S:W = halved, so 2: 200
S:A:W::2: 25: 200
Given A = 100.
So, W = 800
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