Question

the length of a hall is double its breadth . its height is 3m. the area of its four walls is (including doors and windows) is 108 m square find its volume

Answer 1

let b be x
therefore,l= 2x
h=3m
according/question
2h(l+b)=areaof 4 walls
2*3(2x+x)=108
6*3x=108
18x=108
x=108/18
=6
l=2*6
=12m
volume = l*b*h
=12*6*3
=216mcube

Answer 2

let the breadth be x m
So, lenght = 2x m
height = 3 m
C. S. A of room = 108 m sq.
means
2 ( l + b) * h = 108 m sq.
2 ( 2x + x) *3= 108 m sq.
6x = 36
x= 6 m
Thus, l = 12m. b = 6 m
Volume = l*b*h
= 12*6*3
= 216 m cube