SOLUTION: How many mL of a 45% acid solution must be mixed with a 35% solution to produce 500 mL of a 40% solution?

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Question 940802: How many mL of a 45% acid solution must be mixed with a 35% solution to produce 500 mL of a 40% solution?
Answer by Alan3354(69443) About Me  (Show Source):
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How many mL of a 45% acid solution must be mixed with a 35% solution to produce 500 mL of a 40% solution?
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40% is the average --> equal amounts.