SOLUTION: How many liters of water must be added to 20 liter of 12% brine solution to dilute it to an 8% solution?

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Question 352032: How many liters of water must be added to 20 liter of 12% brine solution to dilute it to an 8% solution?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Let A be the liters of pure water (0% solution) added.
0%28A%29%2B12%2820%29=8%28A%2B20%29
240=8A%2B160
8A=80
highlight%28A=10%29 liters.