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College Algebra

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Please, I need your help!How much water must be evaporated from 16oz of a 2% salt solution to make a 4% salt solution?

  • College Algebra - ,

    twice the concentration means half the volume, since the same amount of salt remains.

    So, we lost half of 16 oz, or ?

  • College Algebra - ,

    by intuition, it must be 8 oz

    or

    the amount of salt must stay the same, so
    .02(16) = .04(16-x)
    .32 = .64 - .04x
    .04x = -.32
    x = 8

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