The length of a room is 20m and its breadth is 5m. The sum of the areas of floor and the ceiling is equal to the area of the four walls. Find the height of the room.
Area of the floor =l×b=20×5=100 m2
Area of the roof =l×b=20×5=100 m2
Let the height of the room be h
Area of the walls =2(l×h)+2(b×h)