SOLUTION: how many liters of 40% and 80% acids must be mixed in order to make 20 liters of a 55% acid soultion?

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Question 263877: how many liters of 40% and 80% acids must be mixed in order to make 20 liters of a 55% acid soultion?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
.4x+.8(20-x)=.55*20