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MATH PUZZLE: Can you replace...

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

Correct answers: 56

The first user who solved this task is Roxana zavari.

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The doorbell rings. A man open...

The doorbell rings. A man opens the door and there's his mother-in-law on the front step.
She asks, "Can I stay here for a few days?"
The man says, "Sure you can." And he closes the door.

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Giuseppe Mario Bellanca

Born 19 Mar 1886; died 26 Dec 1960 at age 74.Italian-American aviator who designed and built airplanes, including the first U.S. monoplane with an enclosed cabin (1917). He had a flying school (1912-16) at Long Island, N.Y., where he built and learned to fly his first plane. In 1917, he designed the first enclosed-cabin monoplane, which he flew successfully in air races. The CF airliner he created in 1920 could carry four passengers in an enclosed cabin. It won three major performance contests in 1922. Although regarded as “the world's best airplane,” he couldn't sell them, in a market glutted with surplus WW I airplanes. In 1931, Pangborn and Herdon flew a Bellanca plane on the first Japan-to-U.S. nonstop flight.«

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