SOLUTION: How many liters of a 6% solution of salt should be added to a 20% solution in order to obtain 630 liters of a 12% solution?

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Question 877365: How many liters of a 6% solution of salt should be added to a 20% solution in order to obtain 630 liters of a 12% solution?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
Is the percent as mass per volume? Simpler calculation if so.

x for the 6%
y for the 20%

%286x%2B20y%29%2F630=12 and x%2By=630.