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At first glance, this brain teaser looks simple—almost too easy. But don’t let that fool you. It’s designed to test how carefully you read and how well you think beyond the obvious.
Here’s the riddle again:
There are 5 sisters in the room.
Ann is reading a book.
Margaret is cooking.
Kate is playing chess.
Marie is doing laundry.
So, what is the fifth sister doing?
Most people rush to answer this question quickly. Some say the fifth sister is sleeping. Others guess she’s cleaning, watching TV, or maybe even helping one of the others. But all of these answers miss the key detail hidden right in front of you.
This riddle is not about guessing—it’s about observing.
Let’s slow down and look at it carefully.
You are told there are five sisters. Then four of them are named with specific activities:
- Ann is reading
- Margaret is cooking
- Kate is playing chess
- Marie is doing laundry
That leaves one sister unaccounted for.
Now here’s where most people make a mistake: they assume the fifth sister must be doing something completely separate. But the riddle never says that.
Instead, the answer is hidden inside one of the activities already mentioned.
👉 “Kate is playing chess.”
This is the most important line in the entire riddle.
Why?
Because chess is not a one-person activity.