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Math Help - Help with Mixture problems

  1. #1
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    Help with Mixture problems

    Need some help with this. Please!

    I have 150 dL of a 25% solution of peroxide in water. How many dL of pure peroxide should be added to obtain a 40% solution?
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  2. #2
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    (150 dL)(25%) + (x dL)(100%) = (150 + x dL)(40%)

    solve for x
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  3. #3
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    How do you figure = (150 + x dL)(40%)? (Sorry, I'm trying to help my 9th grader and it's been 30 years for me).
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  4. #4
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    (150 dL)(25%) + (x dL)(100%) = (150 + x dL)(40%)

    multiply out the left side, distribute the 40 on the right side

    3750 + 100x = 6000 + 40x

    your 9th grader should be able to finish from here.
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  5. #5
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    Mixtures Problem

    That's the direction he was heading but wasn't sure. He's got it from here. Thanks!
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