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19 July, 08:38

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

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  1. 19 July, 10:03
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    We can assume that we added in Xml water, because the 7%alcohol is unchanged, so we can get the equation of: 0.7 / (10+X) = 5%, than we can know the X=4ml
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