Find the missing number in the sequence below:
I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I?
A man dies of old age on his 25 birthday. How is this possible?
I am a three digit number.
My tens digit is five more than my ones digit.
My hundreds digit is eight less than my tens digit.
What number am I?
The more of this there is, the less you see. What is it?
What building has the most stories?
Which tank will fill first?
I have branches, but no fruit, trunk or leaves. What am I?
Make eight squares by moving only two matchsticks.
Note- Square can be of different sizes.
I ask Joseph to pick any 5 cards out of a deck with no Jokers.
He can inspect then shuffle the deck before picking any five cards. He picks out 5 cards then hands them to me (Jack can't see any of this). I look at the cards and I pick 1 card out and give it back to Joseph. I then arrange the other four cards in a special way, and give those 4 cards all face down, and in a neat pile, to Jack.
Jack looks at the 4 cards i gave him, and says out loud which card Joseph is holding (suit and number). How?
The solution uses pure logic, not sleight of hand. All Jack needs to know is the order of the cards and what is on their face, nothing more.
There is a cryptic organization called Cicada 3301 that posts challenging puzzles online, possibly to recruit codebreakers and linguists.