SOLUTION: how much pure alcohol should be added to 7l of 10% alcohol to increase the concentration to 30% alcohol?

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Question 763695: how much pure alcohol should be added to 7l of 10% alcohol to increase the concentration to 30% alcohol?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
Let v = "how much" pure alcohol to add. Measures in "units".

%2871%2A10%2Bv%2A100%29%2F%2871%2Bv%29=30
Solve for v.