fifth sister is playing chess with Kate.
Why? Because chess requires two players. If Kate is playing chess, someone else in the room must be playing against her. Since there are five sisters altogether and the other three are already occupied, the fifth sister must be Kate’s opponent.
Why This Puzzle Is So Tricky
The puzzle encourages you to assume that every sister is doing something different. But it never actually says that.
That’s what makes this type of riddle so entertaining. The answer isn’t hidden in complicated mathematics—it comes
