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The Swapped Room Numbers (illustration)
FILE No.176Unsolved

The Swapped Room Numbers

Difficulty ★★☆about 5 minLocked RoomDisplaysMix-ups
Was the Room 506 that police recorded as "locked, nothing unusual" really Room 506?

Case Record

At a hotel, a guest, Mr. A, had valuables stolen. Mr. A was staying in Room 506. When the police examined the door marked "506," the door was locked and the room inside was not disturbed. The police recorded, "A locked room; no theft."

Later, however, a cleaner noticed that the door plates for Room 506 and Room 605 had been swapped. The real Room 605 is vacant and locked. Mr. A's room (the real Room 506) had not been properly closed when he left and was not locked.

Your question

What is the relationship between the room the police examined and the room where the theft actually occurred?

Case Files

Diagram

The situationItemDetailA's roomRoom 506. Left unlockedPolice checkedDoor marked "506": locked, undisturbedLater foundPlates 506 and 605 had been swappedRoom 605Vacant and locked
Diagram

Hints

If you get stuck, open the hints one at a time, in order.

Open hint 1

Do the door plates match the real rooms?

Open hint 2

Which real room was the door the police examined?

Open hint 3

Which room was not locked?

Solve It

Your question

What is the relationship between the room the police examined and the room where the theft actually occurred?

Choose the answer closest to the truth.

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The Truth

The police examined the real Room 605, and the theft occurred in the real Room 506, which had the "605" plate

The answer is "The police examined the real Room 605, and the theft occurred in the real Room 506, which had the '605' plate."

Because the plates were swapped, the door marked "506" is the real Room 605. The police examined that locked, vacant room and recorded "nothing unusual."

The theft happened in the real Room 506, whose door was not locked. Its door carried the "605" plate, so no one examined it. The "locked" in the record was about a different room.

Plates versus roomsReal 506 (A's, unlocked)Real 605 (vacant, locked)Plate: "605"Plate: "506"The "506" door police checked = real room 605. The theft happened inreal 506, which wore the "605" plate.
Diagram of the solution

Key Points

  • Separate the label (number) from the actual thing (room)
  • Plates can be swapped
  • Check which room "locked" is about

Why people get fooled

Because you take the door plate as the identity of the room.

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