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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: 106

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

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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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Friedrich Georg Wilhelm von Struve

Died 23 Nov 1864 at age 71 (born 15 Apr 1793).German-Russian astronomer, one of the greatest 19th-century astronomers and the first in a line of four generations of distinguished astronomers. He founded the modern study of binary (double) stars. In 1817, he became director of the Dorpat Observatory, which he equipped with a 9.5-inch (24-cm) refractor that he used in a massive survey of binary stars from the north celestial pole to 15°S. He measured 3112 binaries—discovering well over 2000—and cataloged his results in Stellarum Duplicium Mensurae Micrometricae (1837). In 1835, Czar Nicholas I persuaded Struve to set up a new observatory at Pulkovo, near St. Petersburg. There in 1840 Struve became, with Friedrich Bessel and Thomas Henderson, one of the first astronomers to detect parallax. Astronomer Otto Struve was his great-grandson.

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