The wind is blowing steadily from the west at 10 miles per hour.
The rooster lays an egg exactly on the peak.
Which side of the roof does the egg roll down?
💡 Hint
Ignore the wind and the roof. Reread the third line and ask whether the creature doing the action is able to do it.
Reveal answer
Neither side. Roosters don’t lay eggs; only hens do.
Step-by-step solution
- Check each premise. A rooster on a roof: possible. A steady west wind: possible. A rooster laying an egg: not possible.
- A rooster is a male chicken. Only females, called hens, lay eggs.
- So there is no egg on the roof, and the question of which way it rolls has nothing to be about.
- The wind speed, the wind direction and the color of the barn are distractions. None of them matters once the false premise is spotted.
Why it fools people
The puzzle offers your brain an interesting problem, and brains love interesting problems. The wind and the peak give you something to calculate, so your effort goes there, and the quiet sentence in the middle is accepted without inspection. It’s the same reason a loaded question works in conversation: if the second half is engaging enough, nobody stops to challenge the first half.
Did you get it?
About This Puzzle
This is a farm-country test of attention. It hands you a weather report, a precise location and a question about physics, and it invites you to start calculating right away. Puzzles like this are less about knowledge than about discipline: before you solve a problem, check that the problem describes something that can actually happen. It’s an easy puzzle, and most people get it within a minute, but the way it misleads you is worth understanding, because the same move shows up in arguments, sales pitches and test questions every day.
How to Think About It
Before you think about wind or slopes, audit the story. Go through it one sentence at a time and ask whether each statement could really be true. Puzzles of this kind usually contain one sentence that quietly assumes something false, and everything after it depends on that assumption. Only when every sentence passes the check is it worth doing any physics. This is a good routine for any question that seems to demand a calculation: confirm the premises first, then compute.
Common Traps
The details are the trap. The wind direction pulls you toward the east, since a west wind blows from west to east. The exact position on the peak pulls you toward a careful argument about balance. Both lines of thought are reasonable, which is exactly why they keep your attention away from the one sentence that matters. Another trap is to treat the puzzle as a pun and dismiss it. It isn’t wordplay: the answer follows from a plain fact about farm animals.
Where This Puzzle Comes From
Logicians call this a false premise: a question that assumes something untrue and asks you to reason from it. Folk puzzles of this kind have been told for generations, and the rooster version is a fixture of school puzzle collections. The everyday cousin is the loaded question, which bakes an unproven claim into its wording. Spotting the hidden assumption is one of the most useful skills in logic.
Try This Variation
An electric train is heading north at 80 miles per hour. A strong wind is blowing from the east. In which direction does the smoke from the train blow? Audit the premises before you think about the wind.
Show the answer to the variation
There is no smoke. An electric train runs on power from overhead wires or a powered rail, so it burns no fuel on board and has no smokestack. The speed and the wind are distractions, exactly like the wind on the barn roof.