Clearly, nine days ago, it was Thursday.

Correct Option: B

According to question,
Mohini goes to movies only on Thursday. she went nine days back to movies. Then 9 days back it was Thursday.
7th day will be Thursday , then 8th day will be Friday and 9th day it means today will be Saturday.

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.

Correct Option: C

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.