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Replace the question mark with a number

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

Correct answers: 438

The first user who solved this task is Roxana zavari.

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Natasha Leggero: Boston Blackout

This girl comes up to me with this thick Boston accent and shes like, Hey, youve seriously never woke up at a party and some guy was inside you? I never woke up at a party.

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Heinrich Gustav Magnus

Died 4 Apr 1870 at age 67 (born 2 May 1802).German chemist and physicist who discovered the Magnus effect (the lift force produced by a rotating cylinder, which for example, gives the curve to a curve ball). In chemical research, he discovered the first of the platino-ammonium compounds compounds. Magnus's green salt is [Pt(NH3)4][PtCl4]). With diverse interests in science, he also worked on the absorption of gases by blood, expansion of gases when heated, vapour pressures of water and various solutions, electrolysis, induced and thermoelectric currents, optics, magnetism and hydrodynamics. In 1865, he represented Prussia at a conference called to introduce a uniform metric system of weights and measures into Germany.

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