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

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

He runs but never walks. Murmurs, but never talks. Has a bed, but never sleeps. And has a mouth, but never eats?

Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

A Scientist was fifty years old in the year 2000 but he was forty years old in the year 2010. How can this be possible?

PS: It has a logical answer.

You need to arrange three 7 and mathematical symbols to form number 1?

Can you write down eight eights so that they add up to one thousand?

I am a five-letter word under you,
Remove the first letter and I am above you,
Remove the second as well and I am around you.

Who am I?

What does the following BrainBat signifies?

ABCDEFGHIJKLMNOPQRSTUVWYZ

QQQQQQQQQQQQQQQQQQQQQQQQQ.

The answer I give is yes, but what I mean is no. What was the question?

The picture shows the dice results in each couple of throws. If they are actually following a pattern, can you find out the missing one?