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Replace the question mark with a number

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

Correct answers: 251

The first user who solved this task is Snezana Milanovic.

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At a session with a marriage c...

At a session with a marriage counselor, the wife snapped at her husband: "That's not true! I do so enjoy sex!"
Then, turning to the counselor, she explained: "But this animal expects it four or five times a year!"

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Sir Lawrence Bragg

Died 1 Jul 1971 at age 81 (born 31 Mar 1890). William Lawrence Bragg was an Australian-English physicist and X-ray crystallographer who at the early age of 25, shared the Nobel Prize for Physics in 1915 (with his father, Sir William Bragg). Lawrence Bragg formulated the Bragg law of X-ray diffraction, which is fundamental for the determination of crystal structure: nλ = 2dsinθ which relates the wavelength of x-rays, λ, the angle of incidence on a crystal, θ, and the spacing of crystal planes, d, for x-ray diffraction, where n is an integer (1, 2, 3, etc.). Together, the Braggs worked out the crystal structures of a number of substances. Early in this work, they showed that sodium chloride does not have individual molecules in the solid, but is an array of sodium and chloride ions.

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