SOLUTION: A chemist mixes 12L of a solution that is 45% acid with 8L of a solution that is 70% acid. What is the percent of acid of the mixture?

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Question 923233: A chemist mixes 12L of a solution that is 45% acid with 8L of a solution that is 70% acid. What is the percent of acid of the mixture?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
12*.45+8*.70=(12+8)*x
12*.45+8*.70=20*x
(12*.45+8*.70)/20=x
x = 0.55=
55%