Can you find a pattern and the missing number in the series given below?

100, 155, 258,? , 584, 819.

Why is 6 afraid of 7?

John went to a parrot shop in Mexico, and the parrot owner told him that his parrot is so unique that he repeats everything he hears. John got excited and immediately bought the parrot. John went home and spoke many words, but the parrot does not repeat anything.
He went again to the parrot shop and complaint to the shopkeeper, but the shopkeeper never lied. Explain?

A man walked into a pub and went straight towards the Barman. He asked for a dirty martini from the Barman. The Barman thought something and then pulled out a pistol from his drawer and aimed it directly at the man. Why did he do that?

What is the riddle which can be asked all day with a different correct answer each time.

f you were running a race, and you passed the person in 2nd place, what place would you be in now?

I know a country, If you remove the last alphabet of its name, it will become a part of your body. Do you name it?

I have feet, but no legs. Which animal Am I?

A new Engineering building containing 100 offices had just been completed. John was hired to paint the numbers 1 to 100 on the doors. How many times will John have to paint the number nine (9)?

You are given four tennis balls and asked to arrange those balls in a manner that the distance between each one of them is exactly equal. How will you do it?