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Replace the question mark with a number

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

Correct answers: 104

The first user who solved this task is Djordje Timotijevic.

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Chuck Norris, Arnold Swartzena...

Chuck Norris, Arnold Swartzenagger, and Jean Claud VanDam, were talking one day. Chuck Norris asked, "If you were a musician, who would you be?".
Chuck Norris said, "I would be Motzart."
Jean Claud VanDam said, "I would be Bethoven."
Arnold then said, "I'll be Bach!"

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Carl Wilhelm Scheele

Born 9 Dec 1742; died 21 May 1786 at age 43. (also Karl) Swedish chemist who discovered oxygen in 1772. Scheele, a keen experimenter, worked in difficult and often hazardous conditions. In his only book, Chemical Observations and Experiments on Air and Fire (1777), he stated that the atmosphere is composed of two gases, one supporting combustion, which he named "fire air" (oxygen), and the other preventing it, which he named "vitiated air" (nitrogen). Due to delay in his publication, he lost priority to Priestley's discovery of oxygen in 1774. Scheele discovered many substances, such as chlorine (1774), manganese (1774), tungsten (1781), molybdenum (1782), glycerol, hydrocyanic (prussic) acid, citric acid, hydrogen sulphide and hydrogen fluoride. He also discovered a process resembling pasteurization.

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