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

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

I guess 76.8% of readers will like this riddle.

What's the least number of people should read this post?

Dr Doom invited a group of puzzle fanatics to a party which was oriented toward having puzzle-oriented games. At night, he introduced the guests to a 'unique riddle'. A prize was offered to the one who solved it first.

The guests included six people named Tom Paul, Fox Obama, Jeremy Reener, Alex Murphy, Prim Pastor, and Ellen Page. The winner of the 'unique riddle' contest was to be announced after the dinner. So Dr. Doom stood up and started the announcement:

'Okay now everybody!'
'The winner of�'
'The Hardest Riddle Ever Event'

But before he could complete it, the light went out and his voice was not heard without the mic by anyone. But they already knew who the winner was. Can you deduce the name of the winner?

What does the following represent?

N N N N N N N

A A A A A A A

C C C C C C C

A pond had 60 fish, out of which, all but 20 died.
How many fishes are now present in that pond?

It belongs to you, but other people use it more than you do. What is it?

If you say my name, I will no longer exist. What am I?

Two girls were born to the same mother, on the same day, at the same time, in the same month and year and yet they're not twins. How can this be ?

I am a type of room you cannot enter or leave. Raised from the ground below, I could be poisonous or a delicious treat. What am I?

The day after tomorrow will be three days before Tuesday. Can you find out what is today?