Puzzles

How do you fill the fivegallon bucket with exactly four gallons of water?
in PuzzlesYou have a fivegallon bucket and a threegallon bucket with as much water as you need, but no other measuring devices. How do you fill the fivegallon bucket with exactly four gallons of water?

A drunk man
in PuzzlesA drunk man stands with a cliff one step to his left. He takes steps randomly left and right. Each step has probability p of going left and probability q=1−p of going right. Each step is the same size. If allowed to randomly step indefinitely, what is the probability that the drunk falls off the…

200+ riddles for kids
in PuzzlesGot a clever kid? Try one of these riddles for kids. Some are tricky, some are funny and all will get their brains working! What is a riddle? A riddle is a fun type of brain teaser that exists as a question or statement to be solved. It can be framed in a way that is misleading,…

Rock, Paper, Scissors
in PuzzlesAdam and Eve play rockpaperscissors 10 times. You know that: Who wins? By how much? Riddle from: Popular Mechanics

Two Doors
in PuzzlesYou wake up in an empty room with only 2 doors. Each door has a keyhole where you can peek through. Door A is guarded by a dragon that will incinerate anyone it sees. Door B is simply a hallway, with an odd ceiling, it’s the strongest magnifying glass on earth! It magnifies the sun…

Super Lottery
in PuzzlesWhat are your odds of winning a 100 million person lottery with these rules? You are one of 100 million people playing in a lottery. On each drawing there is exactly one winner. What is the probability that you will win at least once before someone (could be any one of the other players) wins…

100 Prisoners
in PuzzlesCan you help the prisoners communicate using just a light bulb? There are 100 prisoners about to serve solitary confinement. While imprisoned, no prisoner will have contact with any other prisoner – in fact, they will usually never leave their cells. However, each day the warden will pick a prisoner (either at random or arbitrarily)…

2358 puzzle
in PuzzlesUsing 4 math operationsObtain 16 using 2,3,5,8.All numbers must be used.Each number must be used once.You can put parentheses anywhere.Those are numbers, not digits, for example you cannot combine 2 with 3 to make 23.