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Replace the question mark with a number

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

Correct answers: 490

The first user who solved this task is Vladimir Krnac.

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A guy had just returned from t...

A guy had just returned from two weeks of vacation. He asked his boss for two more weeks off to get married.
"What?" shouted the boss, "I can't give you more time now. Why didn't you get married while you were off?"
"Are you nuts?" he replied. "That would have ruined my whole vacation."

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Maurice Farman

Born 21 Mar 1877; died 25 Feb 1964 at age 86.Maurice Alain Farman was a French aircraft designer and aircraft manufacturer who contributed greatly to early aviation. In 1908, with his brother Henri Farman, he made the first circular flight of over 1-km, completing a 1.6-km (one-mile) flight near Paris. They built a plane the following year and flew a record distance of 160 km (100 miles). Four years after that, the two brothers started their own aviation company at Boulogne-sur-Seine, supplying the army in France and other countries. The UK also made use of Farman's inventions, for example, air-screw reduction gears, in WW II. In 1917 the Farman brothers built the first long-distance passenger plane, the Goliath. They were born of English parents in Paris.

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