SOLUTION: how many liters of 25% alcohol solution and 15% alcohol solution must be mixed to obtain 40 liters of a 20% alcohol solution?

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Question 355244: how many liters of 25% alcohol solution and 15% alcohol solution must be mixed to obtain 40 liters of a 20% alcohol solution?
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
20% is the average of 15% and 25%, so it's equal amounts.
--> 20 liters of each