At first glance, this sounds like a complicated math problem.
Here’s the challenge:
A man buys a horse for $60, sells it for $70, buys it back for $80, and sells it again for $90.
Did he make money, lose money, or break even?
Most people answer too quickly—and many get it wrong.
The reason has less to do with math than with how our brains naturally process information.
Why This Puzzle Is So Confusing
When people read the problem, they often try to calculate everything at once.
The buying, selling, buying again, and selling again all become mixed together in their minds.
Our brains naturally search for shortcuts.
Instead of looking at each transaction separately, we try to find one simple answer immediately.
That’s exactly why this puzzle fools so many people.
Let’s Slow It Down
Imagine you’re the man.
First transaction:
You buy the horse for $60.
Your balance: −$60
Then you sell it for $70.
Your balance becomes:
−60 + 70 = +10
So after the first sale…
You’ve made $10.
Second transaction:
Now you buy the horse again.
This time it costs $80.
Your balance becomes:
+10 − 80 = −70
Then you sell it again for $90.
Your balance becomes:
−70 + 90 = +20
The Final Answer
The man finishes with $20 more than he started with.
He made a total profit of $20.
Why So Many People Say $10
Many people accidentally compare only the second purchase and sale.
They notice:
Bought for $80…
Sold for $90…
Profit = $10.
Then they forget they had already earned another $10 during the first trade.
Others incorrectly subtract all the buying prices from all the selling prices in the wrong order, making the puzzle seem much more complicated than it really is.
Your Brain Likes Shortcuts
Psychologists call these shortcuts mental heuristics.
They’re useful most of the time because they help us make quick decisions.
But puzzles like this expose how those shortcuts can sometimes lead us astray.
Instead of evaluating each step carefully, the brain often tries to “feel” the answer.
Sometimes that works.
Sometimes it doesn’t.
A Good Lesson Beyond the Puzzle
This little riddle reminds us of something important:
When a problem feels confusing, it’s often because we’re trying to solve everything at once.
Breaking it into smaller pieces usually makes the answer much clearer.
That’s true not only in math, but also in everyday life.
Big challenges often become much easier once you tackle them one step at a time.
Did You Get It Right?
Be honest…
Before reading the explanation, what was your answer?
- 💰 He made $20
- 🤔 He broke even
- 📉 He lost money
- 😅 Something else?
Sometimes the simplest puzzles are the ones that reveal the most about how we think.
