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Discussion

  1. Out of the three annual examinations, each with a total of 500 marks, a student secured average marks of 45% and 55% in the first and second annual examinations. To have an overall average of 60%, how many marks does the student need to secure in the third annual examination ?
    1. 450
    2. 400
    3. 350
    4. 300
  1. Correct Option: B

    Total marks for three examinations = 3x 500 = 1500

    Total required marks in three examinations = 60% of 1500
    =( 3 x 500 x 60 ) / 100
    = 900

    Marks secured in first examination = 45 % of 500
    =( 500 x 45 ) / 100
    =225

    Marks secured in third examination = 55 % of 500
    =( 500 x 55 ) / 100
    =275

    Thus, the required marks in third examination
    =900 - ( 225 + 275 )
    =900 - 500
    = 400


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