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### Question

Each car of a garage has as many litres of petrol as is the total number of cars in that garage. If there are 196 litres of petrol in all, how many cars are there?

**A**

14.

**B**

12.

**C**

7.

**D**

8.

**Soln.**

**Ans: a**

Let the number of cars = n. So litres of petrol in one car are also n, and therefore, litres of petrol in n cars = $n^2$. We have been given $n^2 = 196$, which gives n = 14.