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

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

What has a bottom at the top?

O_er_t_o_

Complete the missing letters of the given word.

A chess tournament is taking place on knock-out terms (the one who loses the match is out of the game).
(a) If 10 matches are played in total, how many players participated?
(b) If 20 players took part in the tournament, how many matches were played?

What can run but never walk, have a mouth that never speaks, have a head that never weeps, and have a bed but never sleeps?

A four-digit number (not beginning with 0) can be represented by ABCD. There is one number such that ABCD=A^B*C^D, where A^B means A raised to the B power. Can you find it?

A seven-year-old kid challenged his classmates that he can make the number one disappear by adding something to it.

How can he do that?

In the following picture, E is going to slide the object down and as per the terrain and the physics, the round object is going to travel all the way till the end. Now, can you analyze who all people will die when it happens?

When my father was 31 I was 8. Now he is twice as old as me. How old am I?

You can see three almost identical images below. Can you spot the odd one out from them?