Solve the Mystery: Where Did the Last Dollar Go?

  • Context: High School 
  • Thread starter Thread starter Megasundato
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Discussion Overview

The discussion revolves around a classic puzzle involving a hotel room payment scenario, where three men initially pay $30, but later discover the room cost only $25. The puzzle raises questions about the distribution of the remaining money and the perceived missing dollar, exploring the logical reasoning behind the calculations.

Discussion Character

  • Debate/contested
  • Mathematical reasoning

Main Points Raised

  • One participant outlines the initial payment and subsequent distribution of the refund, questioning where the missing dollar is, leading to confusion in the calculations.
  • Another participant clarifies that the total amount paid ($30) minus the bellboy's tip ($2) and the refund to the men ($3) correctly accounts for the hotel room cost ($25), indicating no dollar is missing.
  • A third participant presents a breakdown of the transactions in a structured format, reinforcing the idea that the accounting is correct and there is no missing dollar.
  • Some participants agree that the confusion arises from the misleading equation involving the $9, which does not accurately reflect the transactions.

Areas of Agreement / Disagreement

Participants generally agree that the confusion stems from the misinterpretation of the accounting, but there is no consensus on the best way to explain the situation, as some still find the original puzzle misleading.

Contextual Notes

The discussion highlights the importance of clear mathematical reasoning and the potential for misinterpretation in puzzles involving money distribution. The assumptions made in the problem may lead to confusion if not carefully analyzed.

Megasundato
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So, three men pay for one hotel room which costs $30 each paying $10. Hours later the clerk realized he made a mistake and found out that the hotel room only costed $25, so he sent a bellboy up to the room with $5 to give to the three men. The bellboy realizes that you can't divide $5 evenly among three people, so he takes $2 for himself, tells them it was a tip, and gives each of the men $1.

Later on, the men were balancing their budget and recording what they spent for that day. Their notes read that each man paid $10 at the beginning for a thirty dollar hotel room, but got a dollar back, so basically, it would be as if they each paid $9. Nine times three is twenty-seven and the bellboy has $2 for the tip. collectively, that would make $29.

Where did the other dollar go?
 
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They paid $30. The bell boy kept 2. That leaves $28. He gives the men $3, that leaves $25, which is the cost of the room.

The mistake in this "problem" is that it subtracts 3 but adds the 2, both the 3 and the 2 must be subtracted.
 
Last edited:
HOTEL 0, BUSINESSMEN +30, BELLBOY 0
HOTEL +30, BUSINESSMEN -30
HOTEL -5, BELLBOY +5
BELLBOY -3, BUSINESSMEN +3

Hotel: +25, Businessmen +3, Bellboy +2

No missing dollar.
 
That's right.

The tricky part is when you add in the false equation with the $9.
 
Megasundato said:
That's right.

The tricky part is when you add in the false equation with the $9.

Just like the Chancellor's Budget, every year, in fact.
 

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