SOLUTION: How many quarts of pure alcohol must be added to 10 quarts of 10% alcohol solution to obtain a mixture which is 25% alcohol?

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Question 278762: How many quarts of pure alcohol must be added to 10 quarts of 10% alcohol solution to obtain a mixture which is 25% alcohol?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Let the amount of 100% alcohol be Q.
100Q%2B10%2810%29=25%28Q%2B10%29
100Q%2B100=25Q%2B250
75Q=150
Q=2
Add 2 quarts of 100% alcohol to get 12 quarts of 25% solution.