Question

A court yard is 15 metres long and 10 metres wide. If it is paved by bricks of length 20 cm and width 10 cm, then what is the number of bricks required?
1. 4,500
2. 6,000
3. 7,500
4. 9,000

Answer 1

Correct Answer - Option 3 : 7,500

Given:

The courtyard is 15 metres long and 10 metres wide.

It paved by bricks of length 20 cm and width 10 cm.

Concept Used:

Area of a rectangular area = Length × Breadth/Width

1 meter = 100 cm

Calculation:

Length of the court yard is 15 m = 15 × 100 = 1500 cm

Breadth of the court yard is 10 m = 10 × 100 = 1000 cm

Area of the court yard = 1500 × 1000 cm²

Area covered by one brick = 20 × 10 = 200 cm²

Let, total required number of bricks is n

Accordingly,

200n = 1500 × 1000

⇒ n = 7500

∴ Required number of bricks is 7500.