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Math Help - Percentage word problem

  1. #1
    jet
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    Percentage word problem [SOLVED]

    How many kilograms of pure salt must be added to 5 kg of a 20% salt solution in order to produce a 25% solution?
    I'm not sure how to set up the equations for this type of problem. This is my guess at the equations, but it came out with a negative answer which didn't seem right.


    Code:
    s + 4w = .2
    s + w = 5

    Thanks for any help
    Last edited by jet; May 25th 2008 at 03:32 PM.
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  2. #2
    Eater of Worlds
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    If you let x=the amount of pure salt, then you have:

    x+.20(5)=.25(5+x)

    Solve for x.
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  3. #3
    jet
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    Thanks for the quick reply, I think I understand it now.
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