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What is the missing number?

MATH PUZZLE: Can you replace the question mark with a number?

Correct answers: 95

The first user who solved this task is Djordje Timotijevic.

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A complete idiot

I'm not a complete idiot….Some parts are missing.

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Dental chair patent

In 1848, the first U.S. patent for a surgical or dental operating-chair with adjustable elevation and tilt of the seat and back was issued to M.W. Hanchett of Syracuse, N.Y. (No. 5711). The chair included a footrest with adjustable elevation.[Image: top - full view of seat and foot rest; bottom - detail of tilt cogs beneath seat.]

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