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Label the joints and legs of these graph theory caterpillars so that the vertex sums are all equal.

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Plum Tree

Label this plum tree graph to make it totally magic!

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Olympic Magic

in how many ways can you place the numbers 1, 2, 3 … 9 in the nine regions of the Olympic Emblem (5 overlapping circles) so that the amount in each ring is the same?

The Great Weights Puzzle

Stage: 4 Challenge Level: Challenge Level:3 Challenge Level:3 Challenge Level:3

This problem follows on from 9 Weights

You have twelve weights, one of which is heavier or lighter than the rest, but you don't know which one is heavier or lighter. Using just 3 weighings on the balance, can you identify which weight is the odd one out, and whether it is heavier or lighter?


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