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Math Help - Help with this Word Problem

  1. #1
    Junior Member
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    Help with this Word Problem

    During cold weather, a car with a 20 Liter radiator containing 10% antifreeze must increase the solution to 25% antifreeze. How many liter of 10% antifreeze must be drained and replaced with 100% antifreeze?
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  2. #2
    Junior Member
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    Re: Help with this Word Problem

    Let x L be removed so remaining is (20 x)
    and Let x L of 100% antifreez be relpaced.
    (20 x) 10/100 + x 100/100 = 20 25/100
    2 0.1x + = 5
    0.9x = 3
    x = 3 1/3 L be replaced.
    ----
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