Answer:
When can you add two to eleven and get one as the correct answer?
What is yours but only used by others?
What man can shave 10 times a day and still have a beard?
In 1990, a person is 15 years old. In 1995 that same person is 10 years old. How is this possible?
How do you make the number one disappear by adding to it?
What is always coming but never arrives?