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

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

If you're 8 feet away from a door and with each move you advance half the distance to the door. How many moves will it take to reach the door?

It can be easily calculated that the digits 0 to 9 can be arranged into 3628800 distinct ten-digit numbers.

But do you know how many of these numbers are prime?

You are in a dark room and want to see what is inside it. With you are a match, a candle, and a kerosene lamp. Which do you light first?

The King of a distant land had heard that Birbal was one of the wisest men in the East and so desired to meet Birbal. He sent Birbal an invitation to visit his country.

In due course, Birbal arrived in the distant kingdom. When he entered the palace he was flabbergasted to find not one but six kings seated there. All looked alike. All were dressed in kingly robes. Who was the real king?

The very next moment he got his answer. Confidently, he approached the king and bowed to him.

How did Birbal know who was the real king?

Can you identify the direction in which this bus is moving; left or right?

Hint: The bus is moving on the roads of UK.

An office is divided into 8 cubicles. How many of the cubicles are painted if only 1/8 of the cubicles are painted?

What happened when the wheel was invented?

You have two strings whose only known property is that when you light one end of either string it takes exactly one hour to burn. The rate at which the strings will burn is completely random and each string is different. How do you measure 45 minutes?