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Can you replace the question mark with a number?

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

Correct answers: 43

The first user who solved this task is Nílton Corrêa de Sousa.

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College student: "Hey, Dad! I've got some great news for you!"

Father: "What, son?"

College student: "Remember that $500 you promised me if I made the Dean's list?"

Father: "I certainly do!"

College student: "Well, you get to keep it."

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First black astronaut

In 1983, Guion S. Bluford Jr. became the first black American astronaut to travel in space, aboard the third flight of the shuttle Challenger on the eighth Space Shuttle Mission. This was the first mission to launch and land at night. During 98 orbits of the Earth in 145 hours, the crew deployed the Indian National Satellite (INSAT-1B); operated the Canadian-built Remote Manipulator System with the Payload Flight Test Article; operated the Continuous Flow Electrophoresis System with live cell samples; conducted medical measurements to understand biophysiological effects on space flight. STS-8 landed on 5 Sep 1983. By 1992, Bluford had spent 688 hours on four space shuttle flights.«

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