A solution consists of only water and alcohol such that the ratio of alcohol to water in the solution is 7:3...

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Source: e-GMAT

A solution consists of only water and alcohol such that the ratio of alcohol to water in the solution is 7:3. How much amount of water should be added to the solution (in milliliters) so that the resulting solution contains 60% alcohol?

1. Total quantity of the resulting solution is 350 milliliters.
2. The original solution contains 10.5 milliliters of alcohol for every 4.5 milliliters of water.

The OA is A
Source: — Data Sufficiency |