Replace the question mark with a number
[3173] Replace the question mark with a number - MATH PUZZLE: Can you replace the question mark with a number? - #brainteasers #math #riddles - Correct Answers: 566 - The first user who solved this task is Sanja Šabović
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Replace the question mark with a number

MATH PUZZLE: Can you replace the question mark with a number?
Correct answers: 566
The first user who solved this task is Sanja Šabović.
#brainteasers #math #riddles
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In 1856, the first practical U.S. folding machine to fold book and newspaper sheets was patented by Cyrus Chambers, Jr. of Pennsylvania (No. 15,842). It made three right angle folds to produce a sixteen page folded signature. The machine was installed in the Bible printing house of Jasper Harding & Son, Philadelphia, Pa. Although the accuracy of early folders was poor, with hand folding still predominating for better grade work, development of the folding machine after 1862 was rapid, and in 1873 a machine was patented that would fold a 16-page section and one of 8 pages, inset the latter, and paste it in place. That same year devices to cut and slit paper as it went through the machine were introduced.
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