SOLUTION: One solution containing 18% alcohol is mixed with another solution containing 72% alcohol to make 12 gallons of a solution that is 40% alcohol. How much of each solution is used?

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Question 1129699: One solution containing 18% alcohol is mixed with another solution containing 72% alcohol to make 12 gallons of a solution that is 40% alcohol. How much of each solution is used?
Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
x gallons of the 72% alcohol
12-x gallons of the 18% alcohol

Sum of the alcohol in the two parts equals the amount of alcohol in the solution.
72x%2B18%2812-x%29=40%2A12
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