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What is the missing number?

MATH PUZZLE: Can you replace the question mark with a number?

Correct answers: 68

The first user who solved this task is Jakubovski Vladimir.

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Can You Hear Him?

On his first day back to work after the birth of his son, Randy's supervisor said, "I understand you have a new youngster at your house?"
Randy glanced around apprehensively, "For heaven's sake, you can't hear him all the way out here, can you?"

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Sir Alfred Ewing

Born 27 Mar 1855; died 7 Jan 1935 at age 79.Sir James Alfred Ewing was a Scottish physicistwho discovered and named hysteresis (1881), the resistance of magnetic materials to change in magnetic force. Ewing was born and educated in Dundee and studied engineering on a scholarship at Edinburgh University. He helped Sir William Thomson, later Lord Kelvin in a cable laying project. In 1878 he became professor of Mechanical Engineering and Physics at Tokyo University, where he devised instruments for measuring earthquakes. In 1903 he moved to the Admiralty as head of education and training, where during WW I, he and his staff took on the task of deciphering coded messages.

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