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Calculate the number 1431

NUMBERMANIA: Calculate the number 1431 using numbers [6, 9, 8, 3, 21, 220] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.

Correct answers: 22

The first user who solved this task is Djordje Timotijevic.

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Michael Owens

Died 27 Dec 1923 at age 64 (born 1 Jan 1859).Michael Joseph Owens was an American inventor and manufacturer who invented the automatic glass bottle making machine that revolutionized the industry. His mechanization of the glass-blowing process eliminated child labor from glass-bottle factories. He took out patents in 1895 on a glass molding machine capable of crude results. In 1903, he formed the Owens Bottle Machine Company. By the next year his continuing improvements led to patents on a machine capable to producing four bottles per second. Owens' machines could be built with from six to twenty arms, each blowing a bottle. He expanded with a factory in England in 1905. He retired from management in 1919 to focus on inventing, and eventually held 45 U.S. patents.«

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