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Calculate the number 399

NUMBERMANIA: Calculate the number 399 using numbers [4, 2, 7, 4, 22, 670] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.

Correct answers: 2

#brainteasers #math #numbermania

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Only a Half Wit

Joe: "I've heard about your wit."
Moe: "Oh, that's nothing."
Joe: "Yeah, that's what I've heard."

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Marcel Roland de Quervain

Born 17 May 1915.Swiss glaciologist who investigated the physical properties of snow, which he applied to the development of avalanche warning systems and the mitigation of other problems associated with snowfields. An example of his work is the study of the metamorphism and the hardening of snow relative to the pressure and temperature gradient. He joined the Swiss Federal Snow and Avalanche Research Institute in 1943 as assistant director and became its director in 1950. He retired in 1980.«

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