Answer:
A town has only two barbers. One of the barbers has a nice, tidy haircut, and the other has a shaggy, messy haircut. Which barber should you go to?
There are two sisters: one gives birth to the other and she, in turn, gives birth to the first. Who are the two sisters?
Mr. Smith has two children. If the older child is a boy, what are the odds that the other child is also a boy?
How do you discover something that does not exist?
10 fish are in a tank. 2 Drown, 4 Swim away, and 3 Die. How many are left?
If you count 20 houses on your right going to the store and 20 houses on your left coming home, how many houses did you count?