SOLUTION: pure acid is to be added to a 20% acid solution to obtain 40L of a 40% acid solution. What amounts of each should be used?

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Question 1011116: pure acid is to be added to a 20% acid solution to obtain 40L of a 40% acid solution. What amounts of each should be used?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
v, how much of the pure acid to add.

%2820%2840-v%29%2B100%2Av%29%2F40=40

Solve for v, and evaluate 40-v.