SOLUTION: A chemist wishes to create 12L of 30% acid by mixing water with a solution that is 80% acid. How much of each should be mixed together?

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Question 971787: A chemist wishes to create 12L of 30% acid by mixing water with a solution that is 80% acid. How much of each should be mixed together?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
x, how much acid by volume
12-x, how much water by volume

80%2Ax%2F%2812%29=30

x=30%2812%2F80%29

Simplify and then find 12-x for the water.