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Replace the question mark with a number

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

Correct answers: 560

The first user who solved this task is Sanja Šabović.

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A blonde goes to the doctor's...

A blonde goes to the doctor's and find out she is pregnant with twins. She starts crying and the doctor asks her what's wrong. She replies, "I know who the dad is for one of them but I don't know who the dad is for the other one!"

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Andrija Mohorovicic

Died 18 Dec 1936 at age 79 (born 23 Jan 1857).Croatian meteorologist and geophysicist who discovered the boundary between the Earth's crust and mantle, a boundary now named the Mohorovicic discontinuity. In 1901 he was appointed head of the complete meteorological service of Croatia and Slavonia, he gradually extended the activities of the observatory to other fields of geophysics: seismology, geomagnetism and gravitation. After the Pokuplje (Kupa Valley) earthquake of 8 Oct 1909, he analyzed the spreading of seismic waves with shallow depths through the Earth. From these, he was the first to establish, on the basis of seismic waves, a surface of velocity discontinuity separating the crust of the Earth from the mantle, now known as the Mohorovicic discontinuity.

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