Question

A car travels a distance of 225 km using 25 L of petrol. How much petrol (in L) will be required to cover a distance of 540 L by this car?

Answer 1

More petrol will be required for covering more distance. So, this is a case of direct proportion.
$\begin{array}{ccc}Distancetravelled\left(km\right)& 225& 540\\ Petrolrequired\left(L\right)& 25& x\end{array}$

Then,
$\frac{225}{25}=\frac{540}{x}x=\frac{540\times 25}{225}x=60L$.