Answer:
If four people can repair four bicycles in four hours, how many bicycles can eight people repair in eight hours?
It get wetter and wetter the more it dries
What is black when it is clean and white when it is dirty?
He prefers to travel on vines and pal around with gorillas.
Which friend of a witch eats the fastest?
I always have to work with something in my eye. What am I?