SOLUTION: How many mL of a 67% solution should be added to make the solution 72% alcohol?

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Question 697994: How many mL of a 67% solution should be added to make the solution 72% alcohol?
Answer by Alan3354(69443) About Me  (Show Source):
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How many mL of a 67% solution should be added to make the solution 72% alcohol?
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Added to what?