Can you convert the number zero(0) into a positive number using just one mathematical operator ?

You are presented with three boxes. One of them has a red ball inside and the other two have a black ball inside each of them. You are asked to pick up the one with red ball and you pick one. Now, one of the other boxes is opened and it is found to have a black ball.

You are presented with a chance to change your box with the one that is left closed. Will you change your box? Why or why not?

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?

That attorney is my brother, testified the accountant.

But the attorney testified he didn't have a brother.

Who is lying?

What number when divided in half becomes zero?

In the given figure, you can see that four match sticks are used to form a square. Can you form five squares by using six matches?

Can you tell a 3D object that has just two surfaces?

Complete the following series. It.s very logical:

1, 4, 5, 6, 7, 9, 11, __?

Look at the picture and find out which square is not linked with any of the other squares.

In the Thar desert, 3 men found a big 24L Jar is full of water. Since there is a shortage of water so they decided to distribute the water among themselves such that they all have equal amounts of it. But they only have a 13L, a 5L and an 11-litre Jar.

How do they do it?