How many points are there on the globe where, by walking one mile south, then one mile east and then one mile north, you would reach the place where you started?

Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

A chess tournament is taking place on knock-out terms (the one who loses the match is out of the game).
(a) If 10 matches are played in total, how many players participated?
(b) If 20 players took part in the tournament, how many matches were played?

A worker is to perform work for you for seven straight days. In return for his work, you will pay him 1/7th of a bar of gold per day. The worker requires a daily payment of 1/7th of the bar of gold. What and where are the fewest number of cuts to the bar of gold that will allow you to pay him 1/7th each day?

On one occasion, A Boy collects 71 rupees in form of 20 paise and 25 paise. He collects a total of 324 coins.

Can you tell me how many 20-paisa and 25-paisa he got?

In a competitive exam, each correct answer could win you 10 points and each wrong answer could lose you 5 points. You sat in the exam and answered all the 20 questions, which were given in the exam.
When you checked the result, you scored 125 marks on the test.

Can you calculate how many answers given by you were wrong?

If you toss a coin 10 times and it lands heads up every time, what are the chances it will land heads up if you toss it again?

How many times in a given day, minutes and hour clock comes in a straight line ?

What has no start, end, or centre?