SOLUTION: How many liters of a 50% acid solution must be added to 80 liters of 30% solution to obtain a 40%solution?

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Question 419154: How many liters of a 50% acid solution must be added to 80 liters of 30% solution to obtain a 40%solution?
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
40% is the average of 50% and 30%, so it's equal amounts.