Three people check into a hotel room. The receptionist says the bill is £30, so each guest pays £10. Later the receptionist realizes the bill should have only been £25. To correct this, he gives the porter £5 to return to the guests. On the way to the room, the porter realizes he cannot divide…
Welcome to “Cow or Car”! You’re a part of a game show with three doors. Behind one door is a brand-new car, and the other two doors reveal a cow. The game show host, who knows what’s behind each door, asks you to pick one door. After you pick a door (say Door #1), the…
Here’s a slight variation on a classic brainteaser, albeit it’s still a tough one! Three extremely skilled logicians, A, B, and C, are seated around a table. A knows his own IQ is 120, B knows hers is 130, and C knows his is 140. What they don’t know is each other’s IQ. However, they…
You’re on an island with 12 islanders. All of them have perfect logic skills and always tell the truth. They’re also armed with spears, and look very angry. However, they have a task… Among the islanders, 11 islanders weigh exactly the same, and one islander is slightly heavier or lighter. A seesaw can be used…
Three people, named Adam, Beth, and Carl, are standing in a straight line, facing forward. Carl can see both Adam and Beth, Beth can see only Adam, and Adam cannot see anyone. There’s a pile of 5 hats in a cupboard – three blue hats and two red hats. Adam, Beth and Carl are each…
Peter and Maggie are an old married couple, and over the course of their years they’ve found it does them good to take it in turns to lie. Maggie lies on weekdays with ‘n’ in them while Peter lies on days with ‘r’. On which days could they both claim to have lied the day…
