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Calculate the number 1815

NUMBERMANIA: Calculate the number 1815 using numbers [7, 2, 1, 6, 88, 961] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.

Correct answers: 12

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

#brainteasers #math #numbermania

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Francis Pratt

Died 10 Feb 1902 at age 74 (born 15 Feb 1827).American mechanical engineer and manufacturer of machine tools. In 1855 he produced the "Lincoln" milling machine which used a screw drive to improve on F.W. Howe's earlier rack and pinion design. Pratt formed a partnership with Amos Whitney in1860 and together developed the system of interchangeable parts that had been pioneered by Samuel Colt, Elisha Root, Amos' cousin Eli Whitney, and others. This, in turn, led to the need to establish national standards of measurement. The Pratt & Whitney Company was incorporated in 1869, making various types of gauges to enable such standards in manufacturing, making machine tools and tools particularly for the armament industry.«

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