A car uses 2o litre of petrol for a journey of 180km, How many litres will it use for a journey of 108km?.(Assume it travels at the same rate)
We can use the unitary method to solve this problem.
The car uses 20 litres of petrol for a journey of 180 km.
So, for every 1 km it travels, the car uses 20/180 = 1/9 litre of petrol.
Therefore, for a journey of 108 km, the car will use:
(1/9) x 108 = 12 litres of petrol.
So, the car will use 12 litres of petrol for a journey of 108 km, assuming it travels at the same rate.