Subject

    Quantitative Aptitude

    Topic

    Average

    The average of five consecutive odd numbers is 61. What is the difference between the highest and lowest numbers :

    ক)
    4
    খ)
    8
    গ)
    14
    ঘ)
    18

    Explanation

    Let the numbers be x, x + 2, x + 4, x + 6 and x + 8. Then  [x + (x + 2) + (x + 4) + (x + 6) + (x + 8) ] / 5 = 61. or 5x + 20 = 305 or x = 57. So, required difference = (57 + 8) - 57  = 8

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