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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. 12
C.15
D.23
Answer and Feedback
Answer:B
Feedback:Let the number of boys be x. Then, number of girls = 2x.
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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