SOLUTION: How many gallons of a 50% alcohol solution must be mixed with 30 gallons of an 18% solution to obtain a solution that is 40% alcohol?

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Question 911241: How many gallons of a 50% alcohol solution must be mixed with 30 gallons of an 18% solution to obtain a solution that is 40% alcohol?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
.50x + .18(30G) = .40(30G + x)
x = .22(30G)/.10, gallons of a 50% alcohol solution that must be used