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Part ACSIR NET December 2025every-pour-must-empty-the-source-or-fill-the-destination

Every pour must empty the source or fill the destination

From a fully-filled vessel of 12-litre capacity, to bring 6 litres of water into an empty vessel of 8-litre capacity, what is the minimum number of times water must be poured, given that an empty 5-litre vessel is also available for use?

  1. A.4
  2. B.5
  3. C.6✓
  4. D.7

You have the answer. Trap Analysis is why the other three were written.

Not a worked solution repeated four times — the specific reasoning error each wrong option was built to reward.

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