GeneralSolvesv1

Measure exactly four litres with two jugs

Repeated filling and pouring leaves a known remainder.

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Output
Exactly 4 litres remain in the 5-litre jug
Input
An unmarked 3-litre jug, an unmarked 5-litre jug and unlimited water
Relationship

What connects the input and output?

Fill the 5-litre jug and pour into the 3-litre jug, leaving 2 litres. Empty the smaller jug, transfer the 2 litres into it, refill the 5-litre jug, then top up the smaller jug with 1 litre.

Sources

1
  1. en.wikipedia.org: Measure exactly four litres with two jugsen.wikipedia.orgCC-BY-SA-4.0

Discussion

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