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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: 97

The first user who solved this task is Nasrin 24 T.

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Take Your Kid To Work Day

An 8 year old girl went to the office with her father on 'Take your kid to work Day'.
As they walked round the office she started crying and getting cranky.
Her father asked what was wrong.
As the staff gathered round she sobbed loudly, "Daddy, where are all the clowns you said you worked with?"

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James Alfred Van Allen

Born 7 Sep 1914; died 9 Aug 2006 at age 91. American physicist who discovered the Earth's magnetosphere, two toroidal zones of radiation due to trapped charged particles encircling the Earth (also known as the Van Allen radiation belts). During WWII he gained experience miniaturizing electronics, such as in the proximity fuse of a missile. After the war, he studied cosmic radiation, taking advantage of the unused German stock of V2 rockets launched into the outer regions of the atmosphere, carrying research devices using radio to relay back the data gathered. He was also involved in the early U.S. space program, and he had radiation measuring instruments on the first U.S. satellite, Explorer 1, launched 31 Jan 1958 with follow-up carried out by satellites Explorer 3 and 4 later the same year.«

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