Question

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

Answer 1

Convert all the given measures into same units.

From the question,

Verandah has length of = 40 m = (40 × 10) dm = 400 dm [Because 1m = 10dm]

Verandah has length of = 15 m = (15 × 10) dm = 150 dm

∴Area of the verandah = (l × b)

= (400 × 150) dm²

= 60000 dm²

Now,

Length of a stone = 6dm (given)

Breadth of a stone = 5dm

∴Area of a stone = (l × b)

= (6 ×5)

= 30 dm²

∴Total number of stones required to pave the verandah = (Area of verandah/ Area of each stone)

= (60000/ 30)

= 2000 stones