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28 September, 02:05

How much water should be added to 20 ml of 20 % alcohol solution to reduce the concentration to 10 %?

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  1. 28 September, 03:46
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    20 more ml using inverse ratio method

    20 : 20%

    x : 10%

    (20 * 20) : 10 = 40

    40 - 20 = 20
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