A number can be multiplied by multiple of nine
i.e 9 18 27 36 45 ...

and the resulting number consist of only one digit.

Can you identify the number ?

2, 3, 5, 9, 17, _ What is the next number in the sequence?

Can you count the number of squares in the figure below?

An infinite number of mathematicians are standing behind a bar. The first asks the barman for half a pint of beer, the second for a quarter pint, the third an eighth, and so on. How many pints of beer will the barman need to fulfill all mathematicians' wishes?

If we add four times the age of John four years from now to five times his age five years from now we get ten times his current age.

How old will John be two years from now?

What is the word or phrase below?
R | E | A | D

Which flower has two lips?

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?

I have eight fingers and two thumbs but I do not live. What Am I?

If you’ve got me, you want to share me; if you share me, you haven’t kept me. What am I?