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Calculate the number 511

NUMBERMANIA: Calculate the number 511 using numbers [4, 1, 3, 7, 78, 597] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.

Correct answers: 9

The first user who solved this task is Nílton Corrêa de Sousa.

#brainteasers #math #numbermania

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Niagara Falls

In 1896, the first long-distance transmission of hydroelectricity from the Niagara Falls Power Company flowed to Buffalo, N.Y., 26 miles away. Although some small-scale use of the water power of the Niagara Falls occurred earlier, this company made the first large-scale utilization for commercial purposes on 26 Aug 1895, when it began supplying power to an aluminium production plant. The power company originated 31 Mar 1886 (though incorporated under a different name). Ground was broken on 4 Oct 1890. By 24 Oct 1893, a contract had been made with the Westinghouse Electric and Mfg. Co. for three 5,000 h.p. generators (two-phase 2,200 volts at 25 cycles/sec). The first 5,000 h.p. turboalternator unit was completed within 18 months.

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