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Calculate the number 933

NUMBERMANIA: Calculate the number 933 using numbers [4, 2, 7, 5, 90, 491] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.

Correct answers: 7

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

#brainteasers #math #numbermania

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Invisible

A psychiatrist's secretary walked into his study and said, "There's a gentleman in the waiting room asking to see you. Claims he's invisible."

The psychiatrist responded, "Tell him I can't see him."

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Frank Alvord Perret

Died 12 Jan 1943 at age 75 (born 2 Aug 1867).American engineer and inventor who later became apioneerfield volcanologist. Using his prior experience at Thomas Edison's labs, at age 20, Perret co-founded the Elektron Mfg Co. in Brooklyn, NY developing the motors, dynamos and electric controls that the company manufactured (and later, elevators). The first American electric elevator (1887) was probably powered by an Elektron motor. He began a second career in 1904 as a volcanologist, using his electrical knowledge to the measure their seismic activity. He became well known for his studies at Vesuvius (1906), Etna (1910), Stromboli and Kilauea (1911). From 1929, he lived at the foot of Mont Pelée, Martinique, where he founded a memorial volcanological museum.«

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