SOLUTION: How many ml of 30% acid should be added to pure acid to make 40 ml of 70% acid?

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Question 753509: How many ml of 30% acid should be added to pure acid to make 40 ml of 70% acid?
Answer by josgarithmetic(39617) About Me  (Show Source):
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How many ml of 30% acid should be added to pure acid to make 40 ml of 70% acid?

Let u = ml. of 30% acid
Let v = ml. of 100% acid.

%2830u%2B100v%29%2F40=70 and u%2Bv=40

Solve for u and v.