room measures 12m x 9m. The floor of room is to be covered by marble tiles measuring 45 cm by 30
cm. How many tiles are needed?
To find out how many tiles are needed, we first need to convert the measurements of the room and the tiles to the same units.
The room measures 12m x 9m.
We can convert meters to centimeters by multiplying by 100: 12m = 1200 cm and 9m = 900 cm.
The tiles measure 45cm x 30cm.
Now we can find out how many tiles are needed by dividing the area of the room by the area of each tile.
Area of the room: 1200 cm * 900 cm = 1080000 cm^2
Area of each tile: 45 cm * 30 cm = 1350 cm^2
Number of tiles needed: Area of the room / Area of each tile = 1080000 cm^2 / 1350 cm^2 = 800 tiles
Therefore, 800 tiles are needed to cover the floor of the room.