Question

How many bricks required to construct a wall 8m long, 6m height and 22.5cm thick if each brick measures (25cmx11.25cmx6cm)

Answer 1

l=8m=8×100cm=800cm
b=6m=6×100cm=600cm
h=22.5cm

V of wall=lbh
=800×600×22.5. cu cm

V of a brick=25×11.25×6 cu cm
$no \: of \: bricks \: = \frac{volume \: of \: wall}{volume \: of \: a \: brick} \\ = \frac{800 \times 600 \times 22.5}{25 \times 11.25 \times 6} \\ = 6400$

6400 bricks are required