SOLUTION: To clean a concrete driveway, a contractor needs a solution that is 30% acid , How many ounces of a 50% acid solution must be mixed with 15oz of a 21% solution to obtain a 30% acid

Question 786035: To clean a concrete driveway, a contractor needs a solution that is 30% acid , How many ounces of a 50% acid solution must be mixed with 15oz of a 21% solution to obtain a 30% acid solution?
Answer by josgarithmetic(39618) (Show Source): You can put this solution on YOUR website!
y = ounces of 50% acid

Solve for y.
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