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

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

You have a square. What you have to do is cut and reassemble the square such that you create a Red Cross sign that has the same volume as that of the square.

A man has a barrel filled with oil that weighs 100 pounds, and then he puts something into it. Now the barrel weighs less than 100 pounds. What did he put in the barrel?

Can you find the mistake in the below statement?

John is found dead in a bare field. Nobody killed John,
John did not commit suicide.

Inspector Jacob found a bag just a few meters away from John which could save his life. What was in the bag?

A mother bought three dress for her triplets daughters(one for each) and put the dresses in the dark. One by one the girls come and pick a dress.
What is the probability that no girl will choose her own dress?

What is the Surname of Barbie Doll?

What four weights can be used to balance from 1 to 30 pounds?

Who always enjoys poor health?

Find the value of "?" in the ball picture Riddle below: