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Replace the question mark with a number

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

Correct answers: 129

The first user who solved this task is Thinh Ddh.

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Two women were sitting on the...

Two women were sitting on the front porch of the farm house when they saw a rooster chasing a hen. The hen ran straight into the road and was killed by a passing car.
One of the women sighed, "How beautiful. She'd rather die."

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A.A. Griffith

Died 13 Oct 1963 at age 70 (born 13 Jun 1893).Alan Arnold Griffith was a British aeronautical engineer. During the late 1920s, A.A. Griffith and F. Whittle independently made the first practical proposals for the use of gas turbine engines in aircraft. Griffith concentrated on developing an axial flow compressor, and in 1929 he proposed a gas turbine engine driving a propeller, the so called turbo-prop engine. Earlier, in 1917, with G.I.Taylor, he published a pioneering article on the use of soap films in solving torsion problems. In 1920, he published a seminal article on the theory of the brittle fracture. At Rolls Royce (1939-60) he designed turbojet engines, and in the 1950s, vertical take-off aircraft. He developed the remarkable "flying bedstead" which first flew in 1954.

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