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7th Class Mathematics Related to Competitive Exam 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 Number of boys behind Kamal in rank = (43 ? 31) = 12.                  


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