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Vending Machine Juice (illustration)
FILE No.130Unsolved

Vending Machine Juice

Difficulty ★☆☆about 5 minEveryday MysteryCircumstancesMaterial properties
Of the four drinks he ran back with, nobody wanted one of them. Why?

Case Record

After club practice on a hot day, a senior student asked a junior, "Buy four drinks, all different kinds, anything cold. And hurry back!" The junior ran at full speed and brought back four drinks.

All four of them normally drink any cold drink without picking favorites. Yet they said they "absolutely don't want to drink" just one of them, and left it.

Your question

What kind of drink was the one left over?

Case Files

Diagram

Juice from the vending machineSenior: four different cold drinks, and hurry backJunior: sprints back with 4 drinksAll four drink anything, yet refuse exactly one
Diagram

Hints

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

Open hint 1

What happens to a drink when you run?

Open hint 2

Which drink is troublesome to open?

Open hint 3

Use the condition "something cold" as well.

Solve It

Your question

What kind of drink was the one left over?

Choose the answer closest to the truth.

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The Truth

A carbonated drink

The answer is "A carbonated drink."

If you shake a can or bottle of a carbonated drink, the contents spray out when you open it. The junior carried them back at full speed, so the shaken soda is scary to open.

Tea and sports drinks are fine even if shaken. And since they asked for "something cold," he would not have bought hot coffee.

Which drink was leftDrinkAfter being shaken by the runTeaNo problemSports drinkNo problemFizzy drinkSprays when openedHot coffeeNot asked for (cold drinks only)
Diagram of the solution

Key Points

  • Focus on the fact that he ran
  • Which drinks cause trouble when shaken?
  • Eliminate what doesn't match the request

Why people get fooled

Because you think in terms of taste preferences.

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