Source: Official Guide for the GMAT 13th Ed. Problem Solving; #200 Official Guide for the GMAT 2015 14th Ed. Problem Solving; #200

3

The ratio, by volume, of soap to

The ratio, by volume, of soap to alcohol to water in a certain solution is 2:50:100. The solution will be altered so that the ratio of soap to alcohol 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?

2 Explanations

1

akshay padman

S:A:W
2:50:100
as per cond 1 and 2
4:50
2: :200
i.e.
4:50:400
now we want to know 100 of A

i.e.
8:100:800

ANS E

Nov 8, 2015 • Comment

1

Michelle Dolan

I was wondering if someone would be so kind as to explain this question. Thank you

Sep 19, 2014 • Comment

Carolyn Shasha, Magoosh Tutor

Hi Michelle!

We're still in the process of uploading explanation videos to the 13th edition questions, but this question is actually the same as one in the 12th edition that we do have a video for! You can see the explanation here: http://gmat.magoosh.com/forum/1268-the-ratio-by-volume-of-soap-to-alcohol

If you still have questions after watching the video, just let us know! :)

Sep 23, 2014 • Reply

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