Answer:
Option C
Explanation:
Let the number of boys be x.Then, number of girls = 2x.
.'. x + 2x = 60 or 3x = 60 or x = 20.
So, the 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.