FILE No.117Unsolved
A jewel on a display stand disappeared. The stand has a weight sensor, and an alarm sounds when the weight changes. It reacts only if the change in weight lasts for several seconds or more. Yet no alarm sounded.
The jewel on the stand had been covered with a cloth. Under the cloth was a sandbag of the same weight as the jewel. The pedestal had not been moved at all.
What method did the culprit use?
If you get stuck, open the hints one at a time, in order.
What does the sensor detect?
After the jewel was taken, what filled the space on the stand?
Has the pedestal moved?
What method did the culprit use?
Choose the answer closest to the truth.
Swapped the jewel for a sandbag of the same weight
The answer is "Swapped the jewel for a sandbag of the same weight."
The alarm sounds when the weight changes. If you take the jewel and place a sandbag of the same weight at the same time, the sensor notices no change.
No sign of the switch being turned off is described, and the pedestal has not moved. The "fake from the start" idea cannot explain why the sandbag is there.
Because you assume "the sensor didn't sound, so it wasn't touched."
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