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Calculate the number 1561

NUMBERMANIA: Calculate the number 1561 using numbers [7, 8, 3, 4, 13, 224] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.

Correct answers: 12

The first user who solved this task is Nasrin 24 T.

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Job interview

On a job interview, the manager handed me his laptop and said, "Sell this to me."
So, I took it, left the office, and headed back to my place.
Eventually, he phoned me and demanded, "Return my laptop immediately!"
I said, "$300, and it's yours!"

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First U.S. gas auto patent

In 1895, George B. Selden of Rochester, New York, received the first U.S. patent for a gasoline-driven automobile. In the patent, which he had filed several years earlier, on 8 May 1879, he described not only the engine but also a complete automobile incorporating such features as a clutch, compressed air self-starter, and steering system (No. 549,160). Seldon maintained that it was the combination of these elements, together with his engine, made the road-engine patentable. As a patent attorney, he knew to delay the issue of the patent by sending ammendments and other communications every two years. Meanwhile, others did the hard work of developing the automobile, and his patent became more valuable. Years of legal wrangling for profits followed.

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