Question

a boat can travel 518.8 km on 129.7 litres of petrol. how much petrol will it need to go 328.8 km.

Answer 1

You can solve the above problem by cross multiplication

518 km = 129.7 L

328.8 km = 'x' L

So

$x \times 518 = 129.7 \times 328.8$

$x = \frac{42645.36}{518}$

$x = 82.327$

Therefore you need 82.327 L of petrol