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7th Class Mathematics Integers Question Bank Number And Ranking

  • question_answer
    In a class of 60, where girls are twice that of boys, Kamal ranked seventeenth from the top. If there are 9 girls ahead of Kamal, how many boys are after him in rank?

    A) 3                                 

    B) 7

    C) 12                  

    D) 23

    Correct Answer: C

    Solution :

    Let the number of boys be x. Then, number of girls = 2x. \[\therefore \] \[x+2x=60\] or \[3x=60\] or \[x=20\]. So, number of boys = 20 and number of girls = 40. Number of students behind Kamal in rank \[(60-17)=43.\] Number of girls ahead of Kamal in rank = 9. Number of girls behind Kamal in rank \[=(40-9)=31\] \[\therefore \] Number of boys behind Kamal in rank \[=(43-31)=12.\]       


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