SOLUTION: How many liters of pure acid should be added to 4 liters of a 10% acid solution to make a solution that is 80% acid?

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Question 812631: How many liters of pure acid should be added to 4 liters of a 10% acid solution to make a solution that is 80% acid?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
.1*4+x=.8(10+x)
x = 38 liters of pure acid