SOLUTION: How many mL of 70% alcohol should be mixed with 20 mL of 20% alcohol to prepare 50% alcohol?

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Question 788848: How many mL of 70% alcohol should be mixed with 20 mL of 20% alcohol to prepare 50% alcohol?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
Let v = mL of the 70% alcohol to use

%2820%2A20%2B70v%29%2F%2820%2Bv%29=50
Solve for v.