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average weight of a+b=45
average weight of b+c=43
average weight of a+c=50
what is the average of a,b,c

  • algebra -

    you want (a+b+c)/3

    (a+b)/2 = 45
    (b+c)/2 = 43
    (a+c)/2 = 50

    Add them up and you have

    (a+b+b+c+a+c)/2 = 45+43+50
    (2a+2b+2c)/2 = 138
    (a+b+c) = 138
    (a+b+c)/3 = 46

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