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

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Question 547190: Moonshine has 50 liters of a 70% alcohol solution. How many liters of pure alcohol must be added to obtain an 80% alcohol solution?
Answer by mathie123(224) About Me  (Show Source):
You can put this solution on YOUR website!
Let x be the number of litres of pure alcohol that is added.
x%281.00%29%2B50%280.7%29=%28x%2B50%29%280.8%29
(Note: each term consists of the number of litres times the percentage of alcohol)
x%2B35=0.8x%2B40
0.2x=5
x=25
Therefore, 25 litres of pure alcohol must be added.