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the average (arithmetic mean) of a and b is 6 and the average of a, b, c is 11. What is the value of c?

  • math -

    (a+b)/2 = 6
    a+b = 12

    (a+b+c)/3 = 11
    a+b+c = 33
    12+c = 33
    c = 21

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