Question

50 students sit in a classroom. each student requires 9m² on floor and 108 m³ in space. if the lenth=25m,find the breadth and height of the room.

Answer 1

50*9=450 =l*b=25b
so,breadth(b)=18 m
and
total volume=108*50=5400=lbh=25*18*h
so,h=12m

Answer 2

each student requires 9m² of floor 
and given the no. of students is 50
So the total area of the room is 9m²X50=450m²
Given the length of the room is 25m
so the Breadth is =450/25=18m

each student requires 108m³ of space 
so total volume of the room is 108X50=5400m³
we know that : Volume=Area X h
                      so⇒5400=450Xh
                          ⇒h=5400/450=  12m