In this question,it is given that,
The volume v of a pyramid with a square base with side length s and height h is

And we have to solve for s.
First we will get rid of 3 by multiplying both sides by 3, that is

And in the next part it is given that , volume is 7700 cubic meters and height is 148 meters .
Substituting these values, we will get
I don't either it is quite hard to be fair
Answer:
1) Who wear: 2:5
Whi don't wear: 3:5
2) 10 don't wear spectacles
3) 25
Hope it helps!!!