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Nina Zumel continues with the puzzles. This one is “The Perplexed Banker”.
In my opinion, this one captures the essence of the “mathematical” aspect of a puzzle. For a mathematical puzzle one often hopes there is a systematic method that makes the puzzle easy. In this case there is indeed a systematic method that makes the puzzle easy. Then explaining the solution is explaining how to apply the method, perhaps followed with some standard description of the method.
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