SOLUTION: how many liters of pure water should be mixed with a 13-L solution of 90% acid to produce a mixture that is 90% water?

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Question 991393: how many liters of pure water should be mixed with a 13-L solution of 90% acid to produce a mixture that is 90% water?
Answer by josgarithmetic(39623) About Me  (Show Source):
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That means, to produce 13 liters of 10% acid.

If v is how much water to add,
13%2A90%2F%2813%2Bv%29=10.