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1 January, 19:34

How much pure alcohol must be added to 400 ml of a 15% solution to make its strength 32%

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  1. 1 January, 20:04
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    Quantity of alcohol = 400*15/100 = 60ml

    x is pure alcohol which must be added : (x + 60) / (x + 400) = 32/100

    100x + 6000 = 32x + 12800 = > 68x = 6800 = > x = 100

    100ml pure alcohol must be added
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