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

I make two people out of one. What am I?

What brings you down but never up?

A father's child, a mother's child, yet no one's son.

Who am I?

A woman is sitting in her hotel room and hears a knock at the door. She opens the door to see a man whom she’s never met before. He says, “I’m sorry, I have made a mistake, I thought this was my room.” He then goes down the corridor and into the elevator. The woman goes back into her room and calls security. What made the woman so suspicious of the man?

Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

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

Nine marbles are arranged in the image below. Can you slide two marbles to form a square?

If,

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

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

D + F = ?

You are stuck on an island where you have nothing. You find four pieces of paper somewhere on the island. What will be your strategy to escape from the island safely?

PS: No other resource is available to you on the island, neither can you build anything.