Question

7. Rohan wants to clean the grass in his garden. The garden is of 11 m long and 4 m wide. He uses a
garden roller of diameter 1.4 m and 2m long. In how many revolutions of the garden roller, Rohan can
finish his work?

Answer 1

Answer:

5 revolutions of the garden roller

Step-by-step explanation:

Length of garden, l = 11 m

Width of garden, b = 4 m

Area of garden = l × b = 11 × 4 = 44 m²

Diameter of roller = 1.4 m

Length of roller = 2 m

Curved surface area of roller = 2 × π × r × h

= 2 × π × (1.4/2) × 2

= 2 × (22/7) × 1.4

= 2 × 22 × 0.2

= 8.8 m²

Number of revolutions = Area of garden / CSA of roller

= 44 / 8.8 = 440 / 88 = 10 / 2 = 5