SOLUTION: How much of a 25% acid solution should be mixed with 5L of a 15% acid solution to obtain a 20% acid solution?

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Question 696075: How much of a 25% acid solution should be mixed with 5L of a 15% acid solution to obtain a 20% acid solution?
Answer by Alan3354(69443) About Me  (Show Source):
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How much of a 25% acid solution should be mixed with 5L of a 15% acid solution to obtain a 20% acid solution?
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20 is the average of 25 & 15 --> an equal amount
5 liters