Question

If a car covers $82.5$ km in $5.5$ litres of petrol, how much distance will it cover in $13.2$ litres of petrol?

Answer 1

The distance covered is directly proportional to the litres of petrol.
Let $a$ distance covered with $13.2$ litres of petrol
So, $\Rightarrow 5.5:13.2=82.5:a$

Applying the rule, product of extremes $=$ product of means

$\Rightarrow 5.5\times a=13.2\times 82.5$

$\Rightarrow a=\frac{13.2\times 82.5}{5.5}$

$\Rightarrow a=198$

Hence, the distance covered with $13.2$ litres of petrol is $198$ km.