Question

A verandah is 40 m long and 15 m broad. It is to be paved with stones, each measuring 6 dm by 5 dm. Find the number of stones required.

Answer 1

Given:
Length of the verandah = 40 m = 400 dm [since 1 m = 10 dm ]
Breadth of the verandah = 15 m = 150 dm
∴ Area of the verandah= (400 $\times$ 150) dm² = 60000 dm²

Length of a stone = 6 dm
Breadth of a stone = 5 dm
∴ Area of a stone = (6 $\times$ 5) dm² = 30 dm²

∴ Total number of stones needed to pave the verandah = $\frac{\mathrm{Area}\mathrm{of}\mathrm{the}\mathrm{verandah}}{\mathrm{Area}\mathrm{of}\mathrm{each}\mathrm{stone}}$

= $\left(\frac{60000}{30}\right)$ = 2000