Complete the table series riddle by finding the number that can replace "??".

Which alphabet letter is a question?

Three people are in a room. Ronni looks at the Nile. The Nile looks at Senthil. Ronni is married but Senthil is not married. At any point, is a married person looking at an unmarried person? Yes, No or Cannot be determined.

I was born in a small house and I live in it all alone. No windows and no doors have been assigned to my house. The only way I can go out is by breaking through the walls of my house.

Who am I?

You are given with the following sum. Each of the letters can be decoded as a digit. If we tell you that D = 5, then can you solve it entirely?

DONALD
+GERALD
=ROBERT

Can you spot the man between the coffee bean in the picture below ?

After a heavy Thanksgiving meal, the night watchman went to work. In the morning, he told his boss he had dreamed that a saboteur planted a bomb in the factory and that he felt it was a warning. The boss promptly fired him. Worker confused, Why boss fire him?

Can you decipher the following common phrase?

T M C
A U O
H S M
W T E

There was an aeroplane crash, every single person died, but two people survived. How is this possible?

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