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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: 31

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

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There's trouble with the car...

Wife: "There's trouble with the car. It has water in the carburetor."
Husband: "Water in the carburetor? That's ridiculous."
Wife: "I tell you the car has water in the carburetor."
Husband: "You don't even know what a carburetor is. I'll check it out. Where's the car?"
Wife: "In the pool."

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Johann Daniel Titius

Born 2 Jan 1729; died 16 Dec 1796 at age 67.Prussian astronomer, physicist, and biologist whose formula (1766) expressing the distances between the planets and the Sun was confirmed by J.E. Bode in 1772, when it was called Bode's Law. Titius suggested that the mean distances of the planets from the sun very nearly fit a simple relationship of A=4+(3x2n) giving the series 4, 7, 10, 16, 28*, 52, 100, corresponding to the relative distance of the six known planets, up to Saturn, and an unassigned value (*) between Mars and Jupiter. Olbers searched for a planetary object at this empty position, thus discovering the asteroid belt. However, since the discovery of Neptune, which did not fit the pattern, the "law" is regarded as a coincidence with no scientific significance.[DSB gives date of death 16 Dec 1796. EB gives 11 Dec 1796.]

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