A room 8 m long, 6 m high and 22.5 cm thick is made up of bricks, each measuring 25 cm × 11.25 cm × 6 cm. The number of bricks required is.

To find the number of bricks required to build the room, we need to calculate the volume of the room and then divide it by the volume of a single brick to determine how many bricks are needed.

Room dimensions: Length = 8 m Height = 6 m Thickness = 22.5 cm = 0.225 m

Brick dimensions: Length = 25 cm = 0.25 m Width = 11.25 cm = 0.1125 m Height = 6 cm = 0.06 m

Now, calculate the volume of the room: Volume of room = Length × Width × Height Volume of room = 8 m × 0.225 m × 6 m = 10.8 cubic meters

Next, calculate the volume of a single brick: Volume of brick = Length × Width × Height Volume of brick = 0.25 m × 0.1125 m × 0.06 m = 0.0016875 cubic meters

Now, divide the volume of the room by the volume of a single brick to find the number of bricks required: Number of bricks = (Volume of room) / (Volume of brick) Number of bricks = 10.8 cubic meters / 0.0016875 cubic meters/brick

Number of bricks ≈ 6400

So, 6400 bricks are required to build the room.