Question

The floor of a room is 66sq.m. If 1/3 of the floor is tiled,what area is not tiled?

Answer 1

Now, consider going across the bottom - 9 feet or 108 inches. This will take 18 of the tiles.

Cosider going up the side - 12 ft or 144 inches. This will take 24 tiles.

For the entire rectangle, you now need 18x24 tiles.

IF you drew the floor on grid paper, with one foot for each two square along the sides and bottom, you will actually SEE a square for each tile (four tiles per square foot). This reinforces the imagery. There are 9x12=108 square feet of floor so seen this way you need 4x108 tiles.

You COULD do it by pure arithmatic: area = 9x12 sq ft. Area of tile = .5x.5 sq ft Divide total area by area of tile to get number of tiles.

Answer 2

The area, which is tiled=(66×1/3)

                                      = 22 m²

∴ The area which is not tiled = (66-22)

                                               = 44 m²