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Replace the question mark with a number

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

Correct answers: 79

The first user who solved this task is Fazil Hashim.

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Harry and Esther are out shopp...

Harry and Esther are out shopping one morning when Esther says, "Darling, it's my mother's birthday tomorrow. What shall we buy for her? She said she would like something electric."
Harry replies, "How about a chair?"

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Simon Marius

Died 26 Dec 1624 at age 51 (born 20 Jan 1573).(Also known as Simon Mayr) German astronomer, pupil of Tycho Brahe, one of the earliest users of the telescope and the first in print to make mention the Andromeda nebula (1612). He studied and named the four largest moons of Jupiter as then known: Io, Europa, Ganymede and Callisto (1609) after mythological figures closely involved in love with Jupiter. Although he may have made his discovery independently of Galileo, when Marius claimed to have discovered these satellites of Jupiter (1609), in a dispute over priority, it was Galileo who was credited by other astronomers. However, Marius was the first to prepare tables of the mean periodic motions of these moons. He also observed sunspots in 1611.«[DSB gives date of birth 20 Jan 1573. EB gives 10 Jan 1573.]

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