Can you think of a smallest +ve number such that if we shuffle the digits of the number, the new number becomes double the original number?

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

Count the number of balls in picture below:

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?

We are a group of eight brothers. We consider the weak, yet we protect the king in every battle. If we move ahead, we never turn back. Who are we?

Can you count the number of triangles inside a triangle?

Can you write down eight eights so that they add up to one thousand?

As shown in the image, the nine Dogs are square fenced. By constructing just two square fences can you make sure that two Dogs cannot meet each other without crossing the fence?

With the help clues provided in the image, can you find the 5 digit key?

Can you count the number of seconds in a year?

Clue: You need to bother about calculation.