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Calculate the number 3997

NUMBERMANIA: Calculate the number 3997 using numbers [6, 8, 2, 1, 97, 642] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.

Correct answers: 16

The first user who solved this task is Djordje Timotijevic.

#brainteasers #math #numbermania

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Aaron Lufkin Dennison

Born 6 Mar 1812; died 9 Jan 1895 at age 82.American watchmaker who was the first person to apply the interchangeable system to the manufacture of watches, and has been called the “father of the American watch factories.”He began work as a journeyman watchmaker in Boston in 1833. Having observed the precision manufacturing of firearms, around 1840 he invented the Dennison Standard Gauge, and then began to develop the "Interchangeable System" (the American System of Watch Manufacturing). In 1849, Dennison partnered with the clockmaker Edward Howard to manufacture interchangeable movement parts, from 1950, to enhance quality and lower the price of watches. He moved to pursue business in Switzerland in 1865 after the American Civil War.«

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