A bag contains 64 balls of eight different colours. There are eight of each colour (including red). What is the least number you would have to pick, without looking, to be sure of selecting 3 red balls?

What's the next in the series?

H, Be, F, S, Mn, Kr, In, Gd, Tl, ?

What can go up a chimney down, but can’t go down a chimney up?

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

If you say my name, I will no longer exist. What am I?

What question can you never answer yes to?

How many triangles are there on the puzzle below?

There is one four-digit whole number n, such that the last four digits of n2 are the original number n

John was a very careless driver, so his owner Jacob gave him an offer that he will get an incentive of Rs.30 for every bottle box he delivered without breaking it and he will be charged Rs.90 for every bottle box he broke. Jacob gave John 100 bottles-box to deliver. After delivery, Jacob paid John Rs.2400. How many bottles-box did John break?

Count the number of squares in the picture below.