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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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Oziel Wilkinson

Born 30 Jan 1744; died 22 Oct 1815 at age 71.American blacksmith and inventor who began manufacturing farm tools, domestic utensils and cut nails using water power at Pawtucket, Rhode Island, from about 1783. He expanded with an anchor-forging shop the next year, and later added a metal rolling and slitting mill. About 1786, he began making iron screws for clothier's and oil presses. In 1791 he built a reverbatory air furnace. By 1800, Wilkinson and his sons had established themselves as the centre of iron products manufacturing in New England, supplying the machinery parts needed by new industries. Wilkinson joined his son-in-law Samuel Slater in the textile industry. Oziel's son, David furnished the iron forgings and castings for the first carding and spinning machines at Slater's Mill.«

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