Question

In a class of 60, where number of girls are twice the number of boys, Kamal is ranked 17${}^{th}$ from the top. If there are 9 girls ahead of Kamal, how many boys are ranked after him?

• A. 7
• B. 12
• C. 23
• D. None of these

Answer 1

The correct option is B

12

Let the number of boys be x.

Then, the number of girls = 2x.

$\therefore$ x+2x = 60 or x = 20.

So, number of boys = 20, 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