🧠 Breaking Logic: The “Missing” 1 BTC Brain Teaser That’s Bending Minds
Three friends walk into a restaurant and split a 30 BTC bill — simple, right?
Each pays 10 BTC, totaling 30 BTC.
But then…
💡 The waiter realizes the bill was only 25 BTC!
To correct it, he returns 5 BTC in 1-BTC coins.
🤔 Unable to split it evenly, he gives 1 BTC back to each friend (3 BTC total)
…and keeps 2 BTC for himself.
Now, here’s the “problem”:
Each friend effectively paid 9 BTC (10 paid - 1 returned)
Total paid = 3 × 9 = 27 BTC
The waiter kept 2 BTC
So...
27 BTC + 2 BTC = 29 BTC?
But they originally paid 30 BTC! 😱
Where’s the missing 1 BTC?!
👉 Spoiler Alert: The Math Is Sound — The Logic Isn’t
This puzzle is a classic misdirection:
The 27 BTC already includes the 2 BTC the waiter kept.
It breaks down like this:
25 BTC (actual bill)
+ 2 BTC (waiter’s tip)
= 27 BTC total spent
The remaining 3 BTC was returned to the friends (1 each)
27 + 3 = 30 BTC — no mystery, no loss.
The trick?
You're not supposed to add the 2 BTC to the 27 — it’s already in there. 😉
💰 Moral of the Story:
Whether you’re counting coins or crypto,
🧾 Always double-check the logic, not just the math.
Even in Web3, sometimes the biggest illusion… is in plain sight.