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

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Manager
Manager
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Joined: 13 Sep 2006
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Schools: Olin Business School - Washington University
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This one is from the OG - I read thru the explanation, but [#permalink] New post 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
Director
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Joined: 23 Jun 2005
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GMAT 1: 740 Q48 V42
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 [#permalink] New post 14 Sep 2006, 19:52
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
  [#permalink] 14 Sep 2006, 19:52
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This one is from the OG - I read thru the explanation, but

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