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Calculate the number 621

NUMBERMANIA: Calculate the number 621 using numbers [7, 5, 2, 5, 31, 138] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.

Correct answers: 11

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

#brainteasers #math #numbermania

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A Doctor while examining a...

A Doctor while examining an old retired Army vet, "when was the last time you had sex?"
With a long pause the vet replies: "1955 I believe."
Doctor: "Whoa! Its been a long while then?"
Vet: Its only 20:15 right now?

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Franz Karl Achard

Died 20 Apr 1821 at age 67 (born 28 Apr 1753). German chemist and experimental physicist who invented a process for the large-scale extraction of table sugar (sucrose) from beets, and in 1801, opened the first sugar-beet factory, in Silesia (now Poland). At first, though simple, the method was costly, He improved it using suggestions of the Institute in France, including that the beets be pressed without cooking them, which saved much expense for fuel. He had succeeded Andreas Sigismund Marggraf upon his death (1782) as director of the “Class of Physics” at the Berlin Academy. It was Marggraf that had first discovered the presence of sugar in beet-root, and isolated it on an experimental scale in 1747. Achard also discovered a method for working platinum and was the first to prepare a platinum crucible (1784).

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