Number of female is : 60 : 5 x 3 = 36 ( students )

Number of male is : 60 - 36 = 24 ( students )

                           Answer : 24 students

Let n is number of pages. I is the page which was removed.

1 + ... + n - i = 3030

3030 + i = ( n +1 ) * n : 2 

It's 23,54

The odd number between the six remaining numbers is:

1337 : 7 = 191

So 7 consecutive numbers are 185 ; 187 ; 189 ; 191 ; 193 ; 195 ; 197

What did you try ?

my mother left 1 apple