Question

A 36 m-long, 15 broad verandah is to be paved with stones, each measuring 6 dm by 5 cm. How many stones will be required?

Answer 1

$\mathrm{Area}\mathrm{of}\mathrm{the}\mathrm{verandah}=\mathrm{Length}\times \mathrm{Breadth}=36\times 15=540{\mathrm{m}}^2$
Length of the stone = 6 dm = 0.6 m
Breadth of the stone = 5 dm = 0.5 m
$\mathrm{Area}\mathrm{of}\mathrm{one}\mathrm{stone}=0.6\times 0.5=0.3{\mathrm{m}}^2$

$$\begin{gathered} \mathrm{Number}\mathrm{of}\mathrm{stones}\mathrm{r}\mathrm{equired}=\frac{\mathrm{Area}\mathrm{of}\mathrm{the}\mathrm{verendah}}{\mathrm{Area}\mathrm{of}\mathrm{the}\mathrm{stone}} \\ =\frac{540}{0.3} \\ =1800 \end{gathered}$$

Thus, 1800 stones will be required to pave the verandah.