SOLUTION: how much pure alcohol should be added to 30 quarts of a 15% alcohol solution to give a 60% solution?

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Question 896888: how much pure alcohol should be added to 30 quarts of a 15% alcohol solution to give a 60% solution?
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
how much pure alcohol should be added to 30 quarts of a 15% alcohol solution to give a 60% solution?
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Add q quarts.
30*15 + 100*q = 60*(30 + q)