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

If,

A + B = C
D - C = A
E - B = C

Based on the above equations, find out the answer for:

D + F = ?

Can you place six X (crosses) in below board without making three in a row in any way ?

Assume there are approximately 5,000,000,000 (5 billion) people on Earth. What would you estimate to be the result, if you multiply together the number of fingers on every person's left hand? (For the purposes of this exercise, thumbs count as fingers, for five fingers per hand.) If you cannot estimate the number then try to guess how long the number would be.

A four-digit number (not beginning with 0) can be represented by ABCD. There is one number such that ABCD=A^B*C^D, where A^B means A raised to the B power. Can you find it?

Can you decipher the two rows to find the hidden word?

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

I am lying and I always lie. Tell me whether I am lying or telling the truth.

A word I know has six letters it contains, remove one letter and 12 remain. What is it?

Which is the smallest number that you can write using all the vowels exactly once?