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

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

In the Chess Board picture below white army is arranged. You need to add a black army on the board such that no piece is under any threat.
Note: Army comprised of 1 king, 1 queen, 2 rooks, 2 bishops, 2 knights, and 8 pawns.

A man started to town with a fox, a goose, and a sack of corn. He came to a stream which he had to cross in a tiny boat. He could only take one across at a time. He could not leave the fox alone with the goose or the goose alone with the corn. How did he get them all safely over the stream?

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

As easy as you can get into me, it is as hard to get out of me.

Do you know what I am?

Through your logical capabilities, can you make 7 an even?

The day before yesterday I was 25 and the next year I will be 28. This is true only one day in a year. What day is my birthday?

Until it is measured, not known. Yet how you miss it when it has gone. What is it?

John was drowned by he was not wet. How?

Four cars come to a four-way stop, each coming from a different direction. They can’t decide who got there first, so they all go forward at the same time. All 4 cars go, but none crash into each other. How is this possible?