SOLUTION: How many liters of a 80% acid solution must be added to 12 liters of a 25% acid solution to produce a 47% acid solution?

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Question 990089: How many liters of a 80% acid solution must be added to 12 liters of a 25% acid solution to produce a 47% acid solution?
Answer by Alan3354(69443) About Me  (Show Source):
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How many liters of a 80% acid solution must be added to 12 liters of a 25% acid solution to produce a 47% acid solution?
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12*25 + 80*x = 47*(12+x) (total acid)
Solve for x