SOLUTION: How many liters of a 20% acid solution must be mixed with a 40% acid solution in order to obtain 30L of a 30% solution?

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Question 901940: How many liters of a 20% acid solution must be mixed with a 40% acid solution in order to obtain 30L of a 30% solution?
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
30% is the average of 20% and 40%, so it's equal amounts.