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Thread: Salt Solutions 2

  1. #1
    Member harpazo's Avatar
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    Salt Solutions 2

    How much water must be evaporated from 240 gallons of a 3 percent salt solution to make 6 percent salt solution?

    I must first multiply 240 by 0.03 to get 7.2.

    Yes?

    My Equation:

    Let x = amount of water to be evaporated

    7.2/(240 - x) = 0.05

    Correct?
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  2. #2
    MHF Contributor

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    Re: Salt Solutions 2

    Yes, except that 6%= 0.06, not 0.05.
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  3. #3
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    Re: Salt Solutions 2

    I suggest you actually solve yourself instead of asking if equation is correct.
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    Member harpazo's Avatar
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    Re: Salt Solutions 2

    Quote Originally Posted by DenisB View Post
    I suggest you actually solve yourself instead of asking if equation is correct.
    If I solve the wrong equation set up this will only frustrate me more. By showing my part and equation (right or wrong) I can then proceed after people with more math practice have read my effort.
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    Member harpazo's Avatar
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    Re: Salt Solutions 2

    Quote Originally Posted by HallsofIvy View Post
    Yes, except that 6%= 0.06, not 0.05.
    It is a typo at my end.
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  6. #6
    Member harpazo's Avatar
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    Re: Salt Solutions 2

    7.2/(240 - x) = 0.06

    7.2 = 0.06(240 - x)

    7.2 = 14.4 - 0.06x

    7.2 - 14.4 = -0.06x

    -7.2 = -0.06x

    -7.2/-0.06 = x

    120 = x

    So, 120 gallons of water must be evaporated.
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