SOLUTION: How many gallons each of a 5% acid solution and a 20% acid solution to make 3 gallons of a 15% acid solution?

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Question 876333: How many gallons each of a 5% acid solution and a 20% acid solution to make 3 gallons of a 15% acid solution?
Found 2 solutions by josgarithmetic, ewatrrr:
Answer by josgarithmetic(39617) About Me  (Show Source):
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
.20x + .05(3gal-x) = .15(3gal),
x = .10(3gal)/.15