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MATH PUZZLE: Can you replace...

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

Correct answers: 150

The first user who solved this task is Miloš Mitić.

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Stenotype

In 1876, the stenotype was patented by John C. Zachos of New York City (No. 175,892). This was the first U.S. patent for a device for printing legible text in the English alphabet at a high reporting speed, which he called a "typewriter and phonotypic notation." The type was fixed on eighteen shuttle bars, two or more of which may be simultaneously placed in position. The impression was given by a plunger common to all bars. He called his new system of shorthand "stenophonotypy."*

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