Question

How many bricks will be required to built a wall 8 m long, 6 m high or 22.5 cm thick , if each brick measure 25 cm by 11.25 cm by 6 cm?

Answer 1

$wall:- <b><u><i>l=8m=800cm h=6m=600cm b=22.5cm volume of the wall=lbh                                 =800*600*22.5                                 =10800000centi metre cube brick; l=25cm b=11.25cm h=6cm volume=lbh              =25*11.25*6              =1687.5 centi metre cube therefore number of bricks=volume of wall/volume of 1 brick                                               = 10800000/1687.5                                               =6400 bricks therefore number of bricks is 6400 bricks$