Simple Math Problems To Fool The Best

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by Super User, 1 week ago.
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A journey back in time to elite, Soviet math preparation schools.

In case you want more:

http://www.3038.org/press/shen.pdf
http://www.tanyakhovanova.com/Coffins/coffinsmain.html
https://arxiv.org/pdf/1110.1556.pdf
http://www.lix.polytechnique.fr/Labo/Ilan.Vardi/mekh-mat.html