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Calculate the number 6709

NUMBERMANIA: Calculate the number 6709 using numbers [2, 4, 5, 7, 61, 898] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.

Correct answers: 10

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

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Quick fire drinks

Guy walks into a bar and says, "Quick, give me three shots of your finest whiskey!"

The bartender pours the shots and the man downs them as quickly as he can.

Bartender says, "What was that about?" Guy says,

"You'd do the same if you had what I have."

Bartender: "What's that?"

Guy: "70 cents."

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Steel-making patent

In 1857, a U.S. patent was issued to William Kelly for Manufacturing of Iron and Steel (No. 17628). Although he had been experimenting with the steel-making process for a few years, he had not patented it until he heard that Henry Bessemer had been granted a patent on a like process. Kelly had not filed first, but he was able to convince the patent office that he was the first to invent the air-blast method of forming steel from iron in a cupula. Kelly thus held rights of priority for his patent. However, Bessemer had important additional steps worked out to mass-produce steel. Bessemer was a businessman and industrialist who made the Bessemer process profitable, but Kelly still benefitted from his share, though smaller, of the vast profits.«[Image: Kelly's converter illustrated from patent diagram, Red arrows indicate the tuyeres through which an air blast is introduced.]

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