Replace the question mark with the correct number.

P is the father of Q and S is the son of R. T is the brother of P and has a daughter U. If R is the sister of P, then what is the relation between U, Q and S?

Can you find out the missing number?

? 4 5 3 5

9 5 7 10 3

What occurs twice in a week, once in a year but never in a day?

How much will a 38° angle measure when looked at under a microscope that magnifies ten times?

What are the next two letters in the following series and why?
W A T N T L I T F S _ _

*Hint: Check Puzzle Title

10 people came into a hotel with 9 rooms and each guest wanted his own room. The bellboy solved this problem.
He asked the tenth guest to wait for a little with the first guest in room number 1. So in the first room, there were two people. The bellboy took the third guest to room number 2, the fourth to number 3, ..., and the ninth guest to room number 8. Then he returned to room number 1 and took the tenth guest to room number 9, still vacant.
How can everybody have his own room?

In a football game, Christina defeated Teresa by 2 - 0 but no man from either side scored. How can this be possible?

A chicken farmer has figured out that a hen and a half can lay an egg and a half in a day and a half. How many hens does the farmer need to produce one dozen eggs in six days?

You can take four of the five letters out of this word, but the pronunciation never changes. What is the word?