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MATH PUZZLE: Can you replace...

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

Correct answers: 83

The first user who solved this task is Djordje Timotijevic.

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Invisible man

Nurse: "The invisible man is here for his appointment."
Doctor: "Tell him I'm sorry I can't see him right now."

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Frisbee

In 1957, the Wham-O Company developed the first frisbee. A representative of the company got the idea for the product when he saw some truck drivers from the Frisbee Pie Co. of Connecticut showing Yale students how to throw pie pins in the air. On 26 Dec 1967, a U.S. patent was issued to the Wham-O Mfg. Co. for their improvement of the Frisbee (U.S. No. 3,359,678) - an “aerodynamic toy to be thrown through the air … in throwing games.” It was described as a saucer shaped throwing implement with a series of concentric discontinuities adjacent the rim on its convex side.Image: patent diagrams of the Frisbee.

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