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Nikolay Bogdanov-Belsky posts

A past puzzle Brainteaser

by David Shaw, 26 August 2020 | 1 comments

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Difficulty: Taxing Here’s a beautiful artwork from 1895, titled Mental calculation. In public school of S. A. Rachinsky, painted by Nikolay Bogdanov-Belsky. Can you solve the puzzle the kids are pondering? If you can’t quite see the equation, here it is:

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