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Jugs with Water

Unknown Author December 22, 2021

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Section: Brain Teasers Category: Deduction

Difficulty: Medium Tags: Featured

You have a 3 liter jug, a 5 liter jug, and an infinite amount of tap water. How can you measure exactly 4 liters of water using the jugs?

SOLUTION

Call the 3 liter jug “small” the 5 liter jug “large”.

Fill the large jug with water.
Pour 3 liters of water from the large jug into the small jug.
Empty the small jug with water.
Pour the remaining 2 liters of water from the large jug into the small jug.
Fill the large jug with water.
Pour water from the large jug into the small jug, until the small jug is full.

Now there are exactly 4 liters of water in the large jug.

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