SOLUTION: How many liters of pure alcohol must be added of 5 liters of a 60% alcohol solution to make a 70% alcohol solution?

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Question 375345: How many liters of pure alcohol must be added of 5 liters of a 60% alcohol solution to make a 70% alcohol solution?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Pure alcohol is a 100% solution.
Let A be the amount of pure alcohol added.
100A%2B60%285%29=70%28A%2B5%29
100A%2B300=70A%2B350
30A=50
highlight%28A=5%2F3%29 liters