SOLUTION: how much water should be added to 30ml of 16% alcohol solution to reduce concentration to 15%

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Question 799792: how much water should be added to 30ml of 16% alcohol solution to reduce concentration to 15%
Answer by Alan3354(69443) About Me  (Show Source):
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how much water should be added to 30ml of 16% alcohol solution to reduce concentration to 15%
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Add w ml
30*16 + w*0 = (30+w)*15