SOLUTION: How many gallons of a 40% alcohol solution must be mixed with 70 gallons of a 13% solution to obtain a solution that is 30% alchol?

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Question 774119: How many gallons of a 40% alcohol solution must be mixed with 70 gallons of a 13% solution to obtain a solution that is 30% alchol?
Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
v = volume, gallons of the 40% alcohol to add
%28v%2A40%2B70%2A13%29%2F%28v%2B70%29=30
find v