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Calculate the number 7539

NUMBERMANIA: Calculate the number 7539 using numbers [5, 8, 2, 1, 65, 913] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.

Correct answers: 8

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

#brainteasers #math #numbermania

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The Shopping Criminal

It was Christmas and the judge was in a merry mood as he asked the prisoner,"What are you charged with?"

"Doing my Christmas shopping early", replied the defendant.

"That's no offense", said the judge. "How early were you doing this shopping?"

"Before the store opened."

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Hertha Marks Ayrton

Died 26 Aug 1923 at age 69 (born 28 Apr 1854). Phoebe Sarah Hertha Marks Ayrton was an English electrical engineer, inventor and mathematician (née Phoebe Sarah Marks) who during her education showed an aptitude for science and mathematics. She invented a sphygmograph (a device that charts pulse beats, but was not the first to do so), and a line divider (a drafting instrument to divide a line into any given number of equal parts). She began working with William Ayrton, whom she subsequently married (1885). Hertha took up her huband’s interest in electric arc experiments. Her design improvements made arc lights quieter and more reliable. She published a book on The Electric Arc (1902). As a woman she was denied a degree from Cambridge, and at first refused membership in the Royal Society (1902). She invented an anti-gas fan (flapper) used during WWI.«[EB gives date of death as 26 Aug 1923; some sources state 23 Aug.]

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