Math Mixture Word Problem

How much water must be added to 1 liter of a 5% saline to get a 2% saline solution

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  1. the amount of saline must be the same before and after mixing:

    .05(1) + 0(x) = .02(1+x)
    .02x = .03
    x = 1.5

    check:
    5% of 1L = .05L saline
    2% of 2.5L = .05L saline

    or, you can say that since you want 2/5 the concentration, you need 5/2 the original volume, or 2.5L

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