Question

A wall $24$ m long, $0.4$ m thick and $6$ m high is constructed with the bricks each of dimensions $25$ cm $\times$ $16$ cm $\times$ $10$ cm. If the mortar occupies $\frac{1}{10}$ th of the volume of the wall, and $n$ is the number of bricks used in constructing the wall then $\frac{n}{10}$ is

Answer 1

Volume of wall $=\left(2400\right)\left(40\right)\left(600\right)=57600000c{m}^3$
Volume of brick $=25\left(16\right)10=4000c{m}^3$
$\frac{1}{10}$ of wall $=\frac{57600000}{10}=5760000$
Remaining wall $=57600000-5760000=51840000$
Number of brick $n=\frac{51840000}{4000}=12960$