Question

The length, breath and height of a wall are $5m,30cm$ and $3m$. How many bricks willbe needed to build of the wall. The dimensions of one brick are $20cm\times 10cm\times 7.5cm$.

Answer 1

GivenThe length of wall $=5m$
$=5\times 100=500cm$
breadth $=30cm$
height $=3m$
$=3\times 1000=300{cm}^3$
The volume of the wall = length $\times$ breadth $\times$ height
$=500\times 30\times 300{cm}^3$
For a brick $=20cm$
breadth $=10cm$
and height $=7.5cm$
Volume of one brick $=\mid \times b\times h$
$=20\times 10\times 7.5{cm}^3$
$\therefore$ Number of bricks needed
$=\frac{\text{Volume of wall}}{\text{Volume of one brick}}$
$\begin{array}{c}=\frac{500\times 30\times 300}{20\times 10\times 7.5}\\ =3000\end{array}$
Hence, 3000 bricks are needed.