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16 April, 23:17

How many liters of water should be evaporated from 60 liters of a 28% salt solution so that the remaining solution contains 32% salt?

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  1. 16 April, 23:45
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    Let w be liters of water evaporated.

    0.28 x 60 = 16.8

    16.8 / 60 - w = 0.32

    16.8 = 0.32 x (60 - w)

    16.8 = 19.2 - 0.32w

    0.32w = 2.4

    w = 7.5
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