Question

A wall is 4m high , 8m long and 22.5cm thick.How many bricks of length 25 cm,breadth 12.5cm and height 8cm are needed to build the wall

Answer 1

length of wall =8m i.e=800cm

width of wall=22.5cm

height of wall=4m I.e=400cm

length of one brick=25cm

breadth of one brick=12.5cm

height of one brick=8cm

so Number of bricks=

Volume of wall/Volume of brick

800×22.5×400/25×12.5×8

=720000/25

=28,80

So Number of bricks required=2880

Answer 2

volume of wall =lbh

volume of wall =400*800*22.5

volume of wall =7200000 cm cube

volume of each brick=25*12.5*8

===2500 cm cube

Number of brick required=7200000/2500

=2880