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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: 588

The first user who solved this task is H Tav.

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A woman goes into an antique s...

A woman goes into an antique shop and says to the owner, "When I was in here last week I saw a big mug with a flat head that holds a lot of beer. I'd like to buy it."
"Sorry," replied the owner, "but I can't sell you that."
"Why not?" asked the customer.
"Because that's my husband."

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Thomas Harriot

Died 2 Jul 1621 (born c. 1560).(also spelled Hariot) Mathematician and astronomer who founded the English school of algebra. He introduced a simplified notation for algebra and his fundamental research on the theory of equations was far ahead of its time. He was able to solve equations, even with negative or complex roots. However, he published no mathematical work in his lifetime. (Artes analyticae praxis, posthumous, 1631). Especially early in his career, he worked on navigation for his patron Walter Raleigh. Harriot carried out extensive telescopic observations of the satellites of Jupiter and of sunspots. When investigating optics, he discovered the sine law and measured the refractive indices of 13 different substances. He investigated free motion and motion resisted in air, and ballistic curves.

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