There are a number of books on a shelf. If one book is the 4th from the left and 6th from the right, how many books are on the shelf?

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

Can you find a number that lies one third of the distance between 1/3 and 2/3?

What runs around the whole yard without moving?

Find out the missing number in the picture attached:

Can you name some countries which do not have the alphabet 'A' in them?

A finger goes in me. You fiddle with me when you're bored. The best man always has me first. What am I?

I have no life, but I can die. What am I?

You walk into a creepy house by yourself. There is no electricity, plumbing, or ventilation. Inside you notice 3 doors with numbers on them. Once you open the doors you will die a particular way. Door No.1 You’ll be eaten by a lion who is hungry. Door No.2 You’ll be stabbed to death. Door No.3 There is an electric chair waiting for you. Which door do you pick?

I am a white box having no key or lid.
Yet there is a golden treasure inside it.

What Am I?