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

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

Replace the question mark with the number below given a simple math problem.

Which alphabet letter is a question?

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

A farmer and his neighbour once went to Emperor Akbar"s court with a complaint. "Your Majesty, I bought a well from him," said the farmer pointing to his neighbour, "and now he wants me to pay for the water."
"That"s right, your Majesty," said the neighbour. "I sold him the well but not the water!"?
The Emperor asked Birbal to settle the dispute. How did Birbal solve the dispute?

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

Can you find out the missing number in the grid?

Find a 9-digit number, which you will gradually round off starting with units, then tenth, hundred etc., until you get to the last numeral, which you do not round off. The rounding alternates (up, down, up ...). After rounding off 8 times, the final number is 500000000. The original number is commensurable by 6 and 7, all the numbers from 1 to 9 are used, and after rounding four times the sum of the not-rounded numerals equals 24.

There is a movie name hidden in the picture that is attached with this question. Can you find out which movie is it?

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?