SOLUTION: How many liters of acid should be mixed with 4 L of a 10% acid solution to produce a solution that is 80% acid?

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Question 638821: How many liters of acid should be mixed with 4 L of a 10% acid solution to produce 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*(4+x)
x=14
add 14 liters of acid to make 18 liters of 80% acid solution