Each wagon has 8 wheels, this number could be 4, 6 or 12 but usually is 8. For the train it depends on the number of wagons
Passenger wagon
Locomotive
In a car park there are some motorbikes, cars and 8 wheeled lorries. If there are 4 handle bars, 44 wheels and 11 vehicles in total, how many of each ?
Each of 16 students uses either a bicycle or a tricycle. If the total number of wheels is 38, how many students use a tricycle?
It's not a BAD WORD.