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MATH PUZZLE: Can you replace...

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

Correct answers: 319

The first user who solved this task is Donya Sayah30.

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Only in America...

Only in America: We work hard on a farm so we can move into town, where we can make more money… so we can move back to the farm.

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Nails patent

In 1795, Jacob Perkins, of Newburyport, Massachusetts, was awarded a U.S. patent for a machine for cutting and heading nails. It was the second year of President George Washington's second term. In 1795, he was issued a patent for an improved nail machine. He established a nail maufacturing business on the Powwow River in Amesbury, Mass. He eventually held 21 American patents, and 19 more in England.

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