There was an aeroplane crash, every single person died, but two people survived. How is this possible?

Can you find the next number in the below sequence
3 , 7 , 10 , 11 , 12 , 17 ?

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?

In a kingdom, King George did not allow any citizen to visit the world outside. Also, only a person with proper paperwork was allowed to enter or he was sent back. A wooden bridge was what connected the kingdom to the world. The king had appointed a sharpshooter who would check the every five minutes on the bridge to check. After checking, he would go back to his hut and return exactly after five minutes again. The bridge took 9 minutes to cross.

A merchant was able to escape the kingdom without harming the shooter. How?

John named his first son Alpha, second Beta, third Charlie and fourth Delta. What is the fifth son's name?

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

Count the number of triangles in the given picture.

Can you complete the sequence?

192, 021, 222, 324, 252, 627, 2__, 9__?

Do you know of a place where the wind blows south and then suddenly shifts direction towards the north?

I look at you, you look at me, I raise my right, you raise your left. What am I?