SOLUTION: How many liters of pure water should be mixed with a 12-L solution of 70% acid to produce a mixture that is 90% water?

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Question 848978: How many liters of pure water should be mixed with a 12-L solution of 70% acid to produce a mixture that is 90% water?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
water view
x+.3(12)=.9(x+12)
acid view
.7(12)=.1(12+y)
x=72., y=72.
72 liters of water