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Discussion :: Average

  1. A pupil's marks were wrongly entered as 83 instead of 63. Due to that the average marks for the class got increased by half (1/2). The number of pupils in the class is:

    2. A.

    10
    B.

     20
    C.

    40
    D.

    73

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    Answer : Option C

    Explanation :

    Let there be x pupils in the class.

    Total increase in marks = [ x x 12] =X2

     X2= (83 - 63)    X2= 20   x= 40.

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