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Which number should replace the question mark?

FUNNY MATH: Which number should replace the question mark?

Correct answers: 27

The first user who solved this task is Slobodan Strelac.

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Harry and Esther are out shopp...

Harry and Esther are out shopping one morning when Esther says, "Darling, it's my mother's birthday tomorrow. What shall we buy for her? She said she would like something electric."
Harry replies, "How about a chair?"

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Aaron Lufkin Dennison

Died 9 Jan 1895 at age 82 (born 6 Mar 1812).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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