If a wheel has 54 spokes, how many spaces are there between the spokes?

Find the next number in the series below.

6 18 270 72090 ?

How many Watermelons are there in the below picture?

I noticed one of the words in the oxford dictionary is spelled incorrectly. What about you?

My friends called me Iron59 because my parents are a chemist and a mathematician. What is my real name?

In a concert, Christina is performing a dance show with her group.
At 10:00, she and her crew were dancing in an absolutely straight line. At that time Christina was standing in 4th position from both the front and back end of the row.

What was the size of her crew?

Sherlock Holmes was challenged to make a pre-drawn line smaller without erasing it. He did it in fractions of seconds. How?

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

You knock a Table over in the library, and suddenly 20 eyes are looking at you.

In the Chess Board picture below white army is arranged. You need to add a black army on the board such that no piece is under any threat.
Note: Army comprised of 1 king, 1 queen, 2 rooks, 2 bishops, 2 knights, and 8 pawns.