SOLUTION: How many liters of a 30% acid solution should be mixed with an 80% acid solution to get 70L of a solution that is 50% acid?

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Question 929953: How many liters of a 30% acid solution should be mixed with an 80% acid solution to get 70L of a solution that is 50% acid?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
x the amount of the 80% solution
.80x + .30(70L - x) = .50(70L)
x = .20(70L)/.50, the amount of the 80% solution
(70L - x),the amount of the 30% solution