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

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

How many letters are in the alphabet?

Using the clues below, what four numbers am I thinking of?

The sum of all the numbers is 31.
One number is odd.
The highest number minus the lowest number is 7.
If you subtract the middle two numbers, it equals two.
There are no duplicate numbers.

There was a strange boy who was born before his father. How can this be possible?

There are two dice with empty faces in front of you and a marker. You can mark any number on each of the faces of the two dice, but you have to display all 31 days of the month using the two of them.

Which numbers will you mark on which dice so that you can easily depict all the dates of the month?

Can you find a pattern and the missing number in the series given below?

100, 155, 258,? , 584, 819.

In a chess board, the queen piece can move horizontally, vertically and diagonally freely. The picture represents the same.Can you place 8 queens on the board in a manner that none of the queens can attack each other?

Railroad Crossing, look out for the cars. Can you spell that, without any R's ?

Make a sentence consisting of three words that have the whole alphabet.