SOLUTION: How much water must be added to 12 L of a 10% solution of salt in water to obtain a 6% solution?

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Question 371004: How much water must be added to 12 L of a 10% solution of salt in water to obtain a 6% solution?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Water is a 0% solution.
Let A be the amount of water added.
0%28A%29%2B10%2812%29=6%28A%2B12%29
120=6A%2B72
6A=48
highlight%28A=8%29liters