A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

A shepherd had 18 sheep, out of which, all but ten died.

Can you tell us how many sheep was he left with?

Can you find out the remainder when 3^300 is divided by 5?

You are given 16 witch hats. The hats are divided in four different colours – red, blue, green and yellow. Every colour has been assigned to four hats. Now each of the hat will be glued with a label of an arithmetic sign – ‘+’, ‘-‘, ‘x’ or ‘/’. But you can label one sign only once on one colour. In such an arrangement, the hats can be uniquely defined by its colour and symbol.

Can you arrange all the 16 hats in a 4x4 grid in a fashion that no two rows and columns have a repetition of colour or sign?
We have arranged four hats in the below picture to assist you.

What is the end of everything?

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

There is a unique number which when multiplied by any number from 1 to 6, we will get the new number that contains the same digits only.

Can you find that number?

Who is that with a neck and no head, two arms and no hands? What is it?

Remove two matchsticks to make the below equation correct.

What can you hold in your right hand, but never in your left hand?