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Math Help - Mixture Problem, please help

  1. #1
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    Mixture Problem, please help

    Question is:

    Brine is a solution of salt and water. If a tub contains 50 lbs of a 5% solution of brine, how much water must evaporate to change it to an 8% solution?

    Thank you in advance for your help in showing me step by step.

    Horizont
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  2. #2
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    If the water is a 5% solution by weight, then you have 2.5 lbs of salt in the solution. So in order for 2.5 lbs to be 8% instead of 5%, you need the solution to be 92% water. Regardless of what the actual numbers are, this puts the water/salt ratio at 92/8, or 23/2. So how many pounds of water are there?
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  3. #3
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    But I do not understand how to write this in an algebra formula. PLEASE HELP. I AM BEGGING FOR HELP. I am pulling my hair out for 2 hours now, about to cry.
    Last edited by Horizont; September 15th 2008 at 05:05 PM. Reason: Confused
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  4. #4
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    I have now been to 4 online forums and an online tutorial live session and nobody knows how to do this problem. I guess I am not as dumb as I thought I was, even though I still don't have the answer.
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  5. #5
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    Quote Originally Posted by Horizont View Post
    I have now been to 4 online forums and an online tutorial live session and nobody knows how to do this problem. I guess I am not as dumb as I thought I was, even though I still don't have the answer.
    S.O.S. Mathematics CyberBoard :: View topic - Mixture Problem, please help
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  6. #6
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    TYVM
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