Question

a car consumes 12 litres of petrol to travel a distance of 144 km how much petrol is required to cover 240 km

Answer 1

$$\begin{gathered} \mathrm{Quantity}\mathrm{of}\mathrm{petrol}\mathrm{consumed}\mathrm{to}\mathrm{travel}144\mathrm{km}=12\mathrm{litres} \\ \mathrm{Quantity}\mathrm{of}\mathrm{petrol}\mathrm{consumed}\mathrm{to}\mathrm{travel}1\mathrm{km}=\left(\frac{12}{144}\right)\mathrm{litres} \\ \mathrm{Quantity}\mathrm{of}\mathrm{petrol}\mathrm{consumed}\mathrm{to}\mathrm{travel}240\mathrm{km}=\left(\frac{12}{144}\times 240\right)=20\mathrm{litres} \end{gathered}$$