SOLUTION: Moonshine has 50 liters of 70% alcohol solution. How many liters of pure alcohol must be added to obtain an 80% alcohol solution?

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Question 363259: Moonshine has 50 liters of 70% alcohol solution. How many liters of pure alcohol must be added to obtain an 80% alcohol solution?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Let A be the amount of 100% alcohol added.
100A%2B70%2850%29=80%28A%2B50%29
100A%2B3500=80A%2B4000
20A=500
highlight%28A=25%29liters