Answer:
Mr. Smith has two children. If the older child is a boy, what are the odds that the other child is also a boy?
What coin doubles in value when half is deducted?
A man is able to contact his long lost brother who has never met. They agree to meet. When the brother arrives he is able to instantly pick him out from the crowd. How is that possible?
The yellow house has yellow window, the red house has red windows, what colour windows does the green house have?
What can fill an entire room without taking up any space?
Soldiers fight it but never changes.