SOLUTION: How many liters of a 90% acid solution must be mixed with a 15% acid solution to get 525 L of a 80% acid solution?

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Question 797976: How many liters of a 90% acid solution must be mixed with a 15% acid solution to get 525 L of a 80% acid solution?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
Generalized: How many liters of a H% acid solution must be mixed with a L% acid solution to get M liters of a T% acid solution?

Know that L%3CT%3CH;
Let u = volume of L%, and v = volume of H%. These are unknown variables.

%28Lu%2BHv%29%2FM=T and u%2Bv=M
Solve for u and v.