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Math Help - Mean of numbers

  1. #1
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    Mean of numbers

    Please help!


    The mean of A and B is 40
    The mean of B and C is 35

    A + B + C = 100

    What is the values of A, B and C?
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  2. #2
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    Quote Originally Posted by Natasha1 View Post
    Please help!

    Hi Natasha1


    The mean of A and B is 40
    The mean of B and C is 35

    A + B + C = 100

    What is the values of A, B and C?
    \frac{A+B}{2}=40\ \Rightarrow\ A+B=80

    \frac{B+C}{2}=35\ \Rightarrow\ B+C=70

    A+B+B+C=A+2B+C=80+70=150

    B=(A+2B+C)-(A+B+C)=150-100

    Then all values may be solved for.
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