SOLUTION: How many gallons of a 50% solution of acid must be mixed with 80 gal of a 15% solution to get a mixture that is 40% acid

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Question 749437: How many gallons of a 50% solution of acid must be mixed with 80 gal of a 15% solution to get a mixture that is 40% acid
Answer by Alan3354(69443) About Me  (Show Source):
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How many gallons of a 50% solution of acid must be mixed with 80 gal of a 15% solution to get a mixture that is 40% acid
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80*15 + x*50 = (80+x)*40