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Calculate the number 725

NUMBERMANIA: Calculate the number 725 using numbers [4, 3, 1, 5, 75, 121] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.

Correct answers: 0

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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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