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Math Help - really basic %'s

  1. #1
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    really basic %'s

    overall 31% 100
    C/W 0% Worth 30% overall
    Exam ?% Worth 70% overall

    Can anyone work out the exam result and then tell me.
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  2. #2
    Senior Member eumyang's Avatar
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    Quote Originally Posted by hotshots25 View Post
    overall 31% 100
    C/W 0% Worth 30% overall
    Exam ?% Worth 70% overall

    Can anyone work out the exam result and then tell me.
    You add up products of percentages and their weights:
    percentage * weight + percentage * weight + percentage * weight +... = overall percentage

    In your case, there are only two categories:
    (CW percentage) * (CW weight) + (exam percentage) * (exam weight) = overall percentage

    Plug numbers in :
    0 * 0.3 + x * 0.7 = .31

    Now solve for x.
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