Question

How many bricks of length $=18c,$, breadth $=10cm$ and height (thickness) $=8cm$ will be needed to build a wall length $=12m$, thickness $=8cm$ and height $=2.4m$?

Answer 1

$L=18$cm, $b=10$cm, $h=8$cm

Volume of cuboid$=L\times B\times H$

Volume of $1$ bricks$=15\times 10\times 8c{m}^3=\frac{18\times 10\times 8}{(100{)}^3}{m}^3$

Volume of wall$=12\times \frac{8}{100}\times 2.4m^3$

$\therefore$ No. of bricks required $=\frac{volumeofwall}{volumeof1brick}$

No. $=\frac{12\times \frac{8}{100}\times 2.4}{\frac{18\times 10\times 8}{(100{)}^3}}=\frac{12\times 8\times 26\times 100\times 100}{18\times 10\times 8}=1600$ bricks.