Question

In a farm, there is a grassland. In the grass land, 3/7 of area is grazed by the cattle and 4/21 is used for plantation of vegetables. What fraction of grassland is left unused?

Answer 1

Answer:

8 / 21

Step-by-step explanation:

let y be the area remaining

so,

4 / 21 + 3 / 7 + y = 1

4/21 + 3*3/7*3 + y = 1

4/21 + 9/21 + y = 1

13/21 + y = 1

y = 1 ― 13/21

y = 8 / 21