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

John and Jacob are twin brothers. One of them is a liar whereas the other one is a truth-teller.

I called their home number and one of them picked up.
I asked. 'Does John lie?' The person replied with a yes.

Whom did I talk with, John or Jacob?

Why do you find that most of the buildings are deprived of the 13th floor?

How can you spell "White of an egg" in one word?
Hint: I know you can spell coke, poke, and joke.

You are in a room with no metal objects except for two iron rods. Only one of them is a magnet.
How can you identify which one is a magnet?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

During which month do people sleep the least?

what does this below rebus represent identXQQQQQME

What famous saying does this rebus mean?

COME SERVED <---
COME SERVED
COME SERVED
COME SERVED
COME SERVED

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