Buy $72 worth of petrol at $1.50 per litre.Car uses 8 litres of petrol per 100km travel.What calculation give the number of km travel before tank...

The problem requests the rule of three to determine the
number of Km covered along the trip.

Suppose that the
maximum capacity of your tank is of 55 l.

We'll apply the
rule of three:

8l are necessary for 100
Km

55 l are necessary for x
Km

x = 55l*100Km/8l

x =
55l*25Km/2l

x = 687.5
Km

So, if your tank capacity is of 55l,
you'll have to travel 687.5 Km to empty your
tank.