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

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

Irene killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

The sum of a mother, her baby and her dog's weight is 170 Kg. How much does the baby weigh if the mother weighs 100 kg more than the combined weight of the baby and the dog, and the dog weighs 60 per cent less than the baby?

What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?

What number comes next in the series?

5 15 5 18 5 24 14 20 _

We have shown you a regular water barrel as below. Without using any measuring device can you check if the barrel is more than half-filled or less than half-filled?

How can you throw a ball as hard as you can and have it come back to you even if it doesn't hit anything there is nothing attached to it and no one else catches or throws it.

A kind heart person buy packed food at 3$/packet from United states and sells them at 1$/packet at Africa. After some time he becomes a millionaire.

How come the guy become millionaire ?

All of Jacob's shoes are red except two.
All of Jacob's shoes are green except two.
All of Jacob's shoes are yellow except two.

How many shoes does Jacob have?

There is one thing that goes round the house and also inside the house but never even share a brief touch. What is it?