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Math

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The average (arithmetic mean) and median of the five numbers a,a,b,c, and c are 20 and 30, respectively. If a < b < c, what is the value of a + c?

  • Math - ,

    5 numbers: a, a, b, c, c

    mean = 20
    --> (2a + b + 2c)/5 = 20
    2a + b + 2c = 100

    median = 30
    ---> b = 30

    so we have
    2a + 30 + 2c = 100
    2a + 2c = 70
    a+c=35

  • Math - ,

    Hahaha

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