Brain Teasers Trivia Mentalrobics
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Periodically 79

Trivia brain teasers have some element of trivia in them, but they are not just pure trivia questions.


Fun:*** (3)
Difficulty:*** (2.37)
Submitted By:beanie89


I am periodically the number 79. Long ago some attempted to make me from 29, but learned it couldn't be done. If you add me to 80 I appear to be 47 temporarily.
What am I?

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