Three friends walk into a restaurant and split a bill of 30 BTC — simple, right?
Each pays 10 BTC. But then the waiter realizes the bill was actually just 25 BTC, not 30!
So, he returns 5 BTC in 1-BTC coins.
Not knowing how to split it evenly, he gives 1 BTC back to each friend (3 BTC total), and quietly keeps 2 BTC for himself.
Let’s break this down:
Each friend paid 10 BTC, but got 1 BTC back
→ Effective payment = 9 BTC each
Total paid = 3 × 9 = 27 BTC
The waiter kept 2 BTC
So… 27 + 2 = 29 BTC?
But they originally paid 30 BTC! 😱
Where’s the missing 1 BTC?
👉 Spoiler: It’s a trick of logic!
The 2 BTC tip is already part of the 27 BTC, not something you add to it.
Here’s the real breakdown:
25 BTC = actual bill
2 BTC = waiter’s tip
= 27 BTC total paid
3 BTC = returned to the friends
= 30 BTC total
Nothing’s missing — it’s just hiding in the math! 😉
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🧩 A classic brain teaser with a Bitcoin twist — and a reminder:
Always check your change, even in crypto! 🔍💰
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