question_answer

When the tank is filled with 20 litres of petrol\[{{\left( \frac{1}{4} \right)}^{\text{th}}}\] part of it is filled. What is the capacity of the tank?

A)  \[10\,l\]              

B) \[60\,l\]  

C) \[40\,l\]              

D) \[80\,l\]