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phoenix9801 Really wants to Beat The GMAT! Default Avatar
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Average problem Post Thu May 31, 2012 10:38 am
Elapsed Time: 00:00
  • Lap #[LAPCOUNT] ([LAPTIME])
    4-
    The average (arithmetic mean) of 20, 60, and 100 is 10 more than the average of 40, 80, and which of the following?

    A) 110
    B) 90
    C) 70
    D) 50
    E) 30

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    aneesh.kg GMAT Destroyer!
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    Post Thu May 31, 2012 12:53 pm
    phoenix9801 wrote:
    4-
    The average (arithmetic mean) of 20, 60, and 100 is 10 more than the average of 40, 80, and which of the following?

    A) 110
    B) 90
    C) 70
    D) 50
    E) 30
    Let the unknown number be x. Then

    (20 + 60 + 100)/3 = (40 + 80 + x)/3 + 10
    60 = 40 + x/3 + 10
    x = 30

    (E) is correct.

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