SOLUTION: How many liters of pure water should be mixed with a 12 liter solution of 90% acid to produce a mixture of 80% water?

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Question 848030: How many liters of pure water should be mixed with a 12 liter solution of 90% acid to produce a mixture of 80% water?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
The lesson which fully explains this is here:

http://www.algebra.com/tutors/Two-Part-Mixture-with-one-material-quantity-unknown.lesson?content_action=show_dev