10 buckets of water fill a tank when the capacity of each bucket is 14 litres. How many buckets will be needed to fill the same tank. if the capacity of each bucket is 7 Litres?

Correct option is B

​Given:

10 bucket of 14 litres each is used

Formula used:

M₁D₁ = M₂D₂

Solution:

According to the formula,

=> M₁D₁ = M₂D₂

=> 10 $$\times$$​ 14 = 7 $$\times$$​ D₂

=> D₂ = 20

Thus, the correct answer is (b).