Question

a wall is 8m long,4m high, and 22.5cm thick. how many bricks of 25cm Length, 12.5cm breadth and 8 CM high are needed to build the wall​

Answer 1

Number of bricks require to make the walls
`=2880bricks`

Explanation:

The number of bricks needed to make the wall:

= Volume of the wall/volume of one brick

The wall and the brick are in the shape of a cuboid:

Volume of the Cuboid=
`Length*Width*Height`

For wall:

`Length= 8 m\\Width=22.5 cm= 0.225 m \\Height=4 m \\`

Volume of the wall=

`=8*0.225*4\\\\=32*0.225\\\\=7.2m^3`

For one Brick:

`Length=25 cm=0.25m\\Width=12.5 cm=0.125\\Height= 8 cm=0.08m`

Volume of one brick=
`Length*width*Height`

`=0.25*0.125*0.08\\\\=0.0025m^3`

Number of bricks required to make the wall:

`=7.2/0.0025=2880 bricks`

`=2880bricks`