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Trần Triệu Tân

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last 3 solved tasks
If b9bb7 - b9cbc = ca6 find number abc. Multiple solutions may exist.
In the following circles, the four outer numbers are used to calculate the number in the middle. Can you figure out the rule to determine what number should replace the question mark in the third circle?
How Many Squares Are There?

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.«

Deciding what Christ...

“Deciding what Christmas gifts to give makes one present tense.”

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