Question

A lane, $150m$ long and $9m$ wide, is to be paved with bricks, each measuring $22.5cm$ by $7.5cm$. Find the number of bricks required.

Answer 1

Length of the road $=150m=15000cm$

Breadth of the road $=9m=900cm$

Area of the road $=$ Length $\times$ Breadth

$=15000\times 900c{m}^2$

$=13500000c{m}^2$

Length of the brick $=22.5cm$

Breadth of the brick $=7.5cm$

Area of one brick $=$ Length $\times$ Breadth

$=(22.5\times 7.5)c{m}^2$

$=168.75c{m}^2$
Number of bricks $=\frac{\text{Area of the road}}{\text{Area of one brick}}=\frac{13500000}{168.75}=80000$ bricks