SOLUTION: a 25 liter solution of alcohol in water is 72% alcohol. how many liters of an 80% solution must be added if the final solution is to be 75% alcohol?

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Question 358972: a 25 liter solution of alcohol in water is 72% alcohol. how many liters of an 80% solution must be added if the final solution is to be 75% alcohol?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Let A be the amount of 80% solution,
72%2825%29%2B80%28A%29=75%2825%2BA%29
1800%2B80A=1875%2B75A
5A=75
highlight%28A=15%29liters