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.

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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) About Me  (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.
highlight%28%285u%2B9%281000-u%29%29%2F1000=7%29
Solve for u.....