A man says, "Brothers and sisters, have I none, but that man's father is my father's son." Who is that man?

Find the missing number in the series below

13 -21 34 -55 ? -144

A boy was at a carnival and went to a booth where a man said to the boy, "If I write your exact weight on this piece of paper then you have to give me $50, but if I cannot, I will pay you $50." The boy looked around and saw no scale so he agrees, thinking no matter what the carny writes he'll just say he weighs more or less. In the end the boy ended up paying the man $50. How did the man win the bet?

Find the next number in the sequence

5 12 24 36 ?

When I get multiplied by any number, the sum of the figures in the product is always me. What am I?

Before Balboa discovered the Pacific Ocean, which was the largest ocean before that?

I always drive my customer away.

Who am I?

There was a competition where the contestants had to hold something. At the end of the event, the winner was a person who had no hands or feet. What was it that the contestants had to hold?

In the city of Brain Teasers, 5% of people do not list their phone numbers. Now if we select random 100 people from the phone directory, then how many people selected will have unlisted phone numbers?

What are the 50th, 63rd and 100th numbers in the sequence below?
4, 5, 8, 8, 9, 9, 12, 13, 13, 13, 17, 18, ...