Daniel is painting the walls and ceiling of a cuboidal hall with length, breadth and height of 15 m, 10 m and 7 m respectively. From each can of paint 100 m2 of area is painted. How many cans of paint will she need to paint the room?
Area of Walls of a Room = 2 x h x (l + b)
= 2 x 7 x (15 + 10)
= 350 m2
Area of Roof = Area of Floor = 150 m2
Total Area to be painted = 350 + 150 = 500 m2
As, one can of paint is enough for 100 sq m
So, 500/100 = 5 cans are needed to paint the hall.