One is to three as three is to five and five is to four and four is the magic number.
What is the pattern?

Two guards were on duty outside a barracks. One faced up the road to watch for anyone approaching from the North. The other looked down the road to see if anyone approached from the South. Suddenly one of them said to the other, "Why are you smiling?"

How did he know his companion was smiling?

Using four sevens (7) and a one (1) create the number 100. Except for the five numerals, you can use the usual mathematical operations (+, -, x, :), root and brackets ()

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?

What runs around the whole yard without moving?

John was driving a bus and got stuck when passing through an underpass. Then came Jacob with a needle and got the bus out of the underpass.

What did the boy do?

A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

Cristina was born in 1888. She just had her 30th birthday today how did that happen?

You knock a Table over in the library, and suddenly 20 eyes are looking at you.

There are three light switches outside a room. One of the switches is connected to a light bulb inside the room.
Each of the three switches can be either 'ON' or 'OFF'.

You are allowed to set each switch the way you want it and then enter the room(note: you can enter the room only once)

Your task is to then determine which switch controls the bulb?