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What is the missing number?

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

Correct answers: 67

The first user who solved this task is Djordje Timotijevic.

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Mark Gross: Can You Help?

A couple days ago, I was crossing this bridge, and there was this character standing there with a cup in his hand. He goes, Hey, can you help out my wife and family? I said, Sure. And I pushed him off the bridge.

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Vito Volterra

Died 11 Oct 1940 at age 80 (born 3 May 1860).Italian mathematician who made important contributions to calculus, and mathematical theories in astronomy, elasticity and biometrics. His mathematical talent appeared as a young boy. In 1905, he began to develop the theory of dislocations in crystals that led to improved understanding of the behaviour of ductile materials. During WWI he established the Italian Office of War Inventions and designed weapons for use by airships, for which he proposed the use of helium instead of flammable hydrogen. He is remembered for achievements in function theory and differential equations. In biology, in 1925, he formulated a pair of differential equations relating populations of prey and predators (also independently proposed by Alfred J. Lotka in 1925).«

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