Replace the question mark with the correct number.

Can you find the 09 errors in the picture below?

What word is pronounced the same if you take away four of its five letters?

Imagine a box with two cogwheels, one big with 24 teeth and one small with 8 teeth. The big one is firmly attached to the center of the box which means it does not turn or move while the small one rotates around the big one.

How many times do you think that the smaller wheel will turn compared to the box when it turns once around the big one?

In an Art Gallary, When the clock hit 11 am, Artist hung the painting number 30. When it struck 4 pm, he hung painting number 240 and when it struck 7:30 pm, he hung painting number 315.

Can you determine, which painting number will he hang when the time is 9:20 pm?

The Little ant seems to be always confused. Do you know why?

My location can be determined by the below rebus.
So where am i ?

In the picture, you can see a chess board. On the top left position, the K marks a knight. Now, can you move the knight in a manner that after 63 moves, the knight has been placed at all the squares exactly once excluding the starting square?

Which Number is the odd one out?

A) 7145
B) 2716
C) 5321
D) 4135

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