SOLUTION: Determine the number of liters each of 9% acid solution and 5% acid solution that must be mixed to end up with 1000 liters of 7% acid solution.

Question 981810: Determine the number of liters each of 9% acid solution and 5% acid solution that must be mixed to end up with 1000 liters of 7% acid solution.
Answer by josgarithmetic(39617) (Show Source): You can put this solution on YOUR website!
Two-part mixture problem, but can be done in ONE variable.

Let u be volume of the 5% acid, and then 1000-u is the volume of the 9% acid.

Want result mixture, 7% acid.

Solve for u.....
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