SOLUTION: How much water should be mixed to a 500 mL of 30% solution of alcohol to have a resulting concentration of 20%?

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Question 1062649: How much water should be mixed to a 500 mL of 30% solution of alcohol to have a resulting concentration of 20%?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
Simple dilution
v is for how much water, in milliliters, to add.
%28500%2A30%29%2F%28500%2Bv%29=20