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Grandma’s One Line (illustration)
FILE No.37Unsolved

Grandma’s One Line

Difficulty ★★☆about 5 minEveryday MysteriesWhat can be inferred without seeingChanges in numbers
The shopkeeper did not see the shoplifting, yet she said the line. Why did she say it?

Case Record

A candy shop with no security cameras. The old woman who runs it comes out to the register about ten seconds after a customer enters. That day, she had just counted the sweets on the shelf right before the boy arrived. There were no other customers in the shop.

Before she came out, the boy put several sweets into his pocket, then bought something else.

At the register, the old woman said to the boy, "Shoplifting is wrong, you know?" His heart nearly stopped, and he cried and apologized. In fact, she had not seen him shoplift.

Your question

Why did she say this?

Case Files

Diagram

CluesItemDetailCamerasNoneOwnerAppears about 10 seconds after a customer entersBefore the boy cameShe counted the sweets on the shelfCustomersOnly the boyWhat changed on the shelf?
Diagram

Hints

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

Open hint 1

Was she looking at the inside of the shop?

Open hint 2

What had she checked about the shelf before the boy came?

Open hint 3

How many customers were in the shop during those ten seconds?

Solve It

Your question

Why did she say this?

Choose the answer closest to the truth.

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The Truth

She noticed sweets were missing from the shelf and the boy was the only one there

The answer is “she noticed sweets were missing from the shelf and the boy was the only one there.”

She had counted the sweets on the shelf just before the boy arrived. When she came out to the register, several were missing. Since the boy was the only customer, he must have taken them. Even without seeing it, she could deduce it from the change in numbers and the circumstances. There were no cameras and it took ten seconds to get to the register, so she could not have seen it. The text says nothing about remembering his face or about a bulging pocket.

How she knewShe counted the sweets before he cameSeveral were missing afterwardOnly the boy had been thereAnswer: she inferred it from the numbers
Diagram of the solution

Key Points

  • What can be known without seeing
  • The change in the number of sweets
  • Only one customer was there

Why people get fooled

You assume she said it because she saw it.

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