SOLUTION: how many liters of 25% alcohol must be mixed with 40 liters of a 35% alcohol solution to obtain a 32% alcohol solution?

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Question 341447: how many liters of 25% alcohol must be mixed with 40 liters of a 35% alcohol solution to obtain a 32% alcohol solution?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Let A be the amount of 25% solution.
25A%2B35%2840%29=32%28A%2B40%29
25A%2B1400=32A%2B1280
7A=120
highlight%28A=120%2F7%29 liters.