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Weekly Problem 14 - 2008

Stage: 3 and 4 Challenge Level: Challenge Level:1

As the product of each pair has the same value, this value must be product of the smallest and largest numbers, that is $5\times72$.

So the number which is paired with $10$ is $5\times72\div10$, that is $36$.

This problem is taken from the UKMT Mathematical Challenges.

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