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

Can you think of a smallest +ve number such that if we shuffle the digits of the number, the new number becomes double the original number?

In a science lab, a petri dish hosts a healthy colony of yeast for an experiment. Now every minute, all the yeast cells divide into two. At noon, there was just a single cell of yeast and at 1:22, the Petri dish was half full. Can you calculate when the dish will be full of yeast?

With pointed fangs I sit and wait; with piercing force I crunch out fate; grabbing victims, proclaiming might; physically joining with a single bite. What am I?

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?

I have eight fingers and two thumbs but I do not live. What Am I?

You have two strings whose only known property is that when you light one end of either string it takes exactly one hour to burn. The rate at which the strings will burn is completely random and each string is different.

How do you measure 45 minutes?

John’s parents have three sons: Snap, Crackle, and what’s the name of the third son?

Decode the below four famous ciphers:

8P of the SS
1M of the E
1S of the SS
60M in 1H

What number comes next in this sequence:
7 8 5 5 3 4 4 _