SOLUTION: what quantity of 80% acid solution must be mixed with a 20% solution to produce 840mL of a 50% solution?

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Question 781982: what quantity of 80% acid solution must be mixed with a 20% solution to produce 840mL of a 50% solution?
Answer by Alan3354(69443) About Me  (Show Source):
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what quantity of 80% acid solution must be mixed with a 20% solution to produce 840mL of a 50% solution?
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50 is the average of 80 & 20, so it's equal parts.