Can you replace the question mark with a number?
MATH PUZZLE: Can you replace the question mark with a number?Correct answers: 91
The first user who solved this task is Fazil Hashim.
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Leather tanningIn 1884, the first U.S. patents for tanning hides and skins through the action of a metallic salt were issued to Augustus Schultz of New York City. His invention of a chrome tanning process enabled leather to be tanned thinner and stronger than by vegetable tanning. (Nos. 291,784 and -5) |