SOLUTION: How much water should be added to 10ml of 7% alcohol solution to reduce concentration to 5%?

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Question 782193: How much water should be added to 10ml of 7% alcohol solution to reduce concentration to 5%?
Answer by Alan3354(69443) About Me  (Show Source):
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How much water should be added to 10ml of 7% alcohol solution to reduce concentration to 5%?
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w = ml of water
10*7 + w*0 = (10 + w)*5