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?

Correct Answer: 12

Explanation:

Let the number of boys be B.
Then, number of girls = 2B.
∴ B + 2B = 60
or 3B = 60
or B = 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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