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What is the missing number?

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

Correct answers: 68

The first user who solved this task is Jakubovski Vladimir.

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Beno Gutenberg

Died 25 Jan 1960 at age 70 (born 4 Jun 1889). American seismologist noted for his analyses of earthquake waves and the information they furnish about the physical properties of the Earth's interior. With Charles Richter, he developed a method of determining the intensity of earthquakes. Calculating the energy released by present-day shallow earthquakes, they showed that three-quarters of that energy occurs in the Circum-Pacific belt.

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