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12-01-2018
Mathematics

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

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748190877 748190877

16-01-2018

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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