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27 December, 08:56

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

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  1. J
    27 December, 11:00
    0
    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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