Question

The length and breadth of a rectangular room are 6m and 5m respectively find its height if area of its four walls is 99m2

Answer 1

Let the height be h m.
Now,
Area of four walls =2h(l+b)
99=2h*11
99/11=2h
9=2h
so h=9/2=4.5m

Answer 2

Length=6m
Breadth =5m
Let height be h m
Area of 4 walls=99m^2
2 (l+b)×h=99
2 (6+5)×h=99
2×11×h=99
h=4.5m
So hope it helps