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

Count the number of triangles in the picture below:

When my father was 31 I was 8. Now he is twice as old as me. How old am I?

Christina is practising her dance steps along with her friends. In a particular sequence, all of them form a row. At that point, Niharika is standing in the 4th position from either end of the row.
Can you find out how many girls are practising together?

How many people must be gathered together in a room, before you can be certain that there is a greater than 50/50 chance that at least two of them have the same birthday?

2, 3, 5, 9, 17, _ What is the next number in the sequence?

Find the Next Number in the Sequence

2 9 3 1 8 4 3 6 5 7 ?

John said, "If yesterday was tomorrow, today would be Friday."

When did John make this statement?

Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

What do you answer even though it never asks you questions?