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Multilink Cubes

If you had 36 cubes, what different cuboids could you make?

Island Hopping

Stage: 2 and 3 Short Challenge Level: Challenge Level:1

To visit $S$ requires a journey from $P$ to $S$ and one back. To visit $P$, $Q$ and $R$ and return to the mainland requires at least $4$ journeys, so at least $2+4=6$ journeys are required to visit all four islands and return.

This problem is taken from the UKMT Mathematical Challenges.