SOLUTION: how many liters of a 10% alcohol solution must be mixed with 60 liters of a 50% solution to get a 20% solution?

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Question 351272: how many liters of a 10% alcohol solution must be mixed with 60 liters of a 50% solution to get a 20% solution?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Let A be the number of liters of 10% alcohol solution.
10A%2B50%2860%29=20%28A%2B60%29
10A%2B3000=20A%2B1200
A%2B300=2A%2B120
highlight%28A=180%29liters