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

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

It was a dark stormy night and a couple were in a car driving madly to a city. The car broke down and the husband had to go get help from someone who spoke his language. He was afraid to leave his wife alone in the car so he locked the car before leaving. When he came back, the car was in the same state as he had left it but his wife was dead, there was blood on the floor and there was a stranger in the car. What happened?

The below given figure comprises of a pattern through which you can determine the missing letter. Can you push your mind to find the pattern and add the missing letter?

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

This is a picture puzzle. You have to guess the name of the movie that can be related to the picture.

If two's company, and three's a crowd, then whats four and five ?

You are confined in a room and given two metal rods. Out of these two rods, one is magnet and the other is the iron rod. They look starkly similar. You don't have any other metal object in the room.

How will you decide which one of those is magnet?

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

Can you count the number of squares in the given picture?

In the picture that is attached with this question, you can find a square which comprises of four little squares inside it. Consider this square to be made with matchsticks. You have to remove two matchsticks such that only two squares remain instead of five.How will you do it ?