Let the number of people and seats be x and y respectively
Number of seats which are filled =
Empty seats = 24
⇒
y−()=24 ⇒
=24 ⇒ y = 66
So, Total number of seats = 66 ----(i)
So, Total number of seats are filled =
=42 Number of people who are sitted on seats =
⇒
42= ⇒ x = 49
So, Total number of people = 49 ----(ii)
Now, From (i) and (ii), we get
So, Seats will be empty if total people will sit in the hall =
66−49=17