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MATH PUZZLE: Can you replace...

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

Correct answers: 456

The first user who solved this task is Nílton Corrêa de Sousa.

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Alfred Church Lane

Died 15 Apr 1948 at age 85 (born 29 Jan 1863).U.S. geologist and educator who, as chairman of committee on measurement of geologic time of the National Research Council (1922-46), originated, promoted, and directed research on the determination of the age of the Earth. He was petrographer, assistant state geologist, and state geologist for the Michigan State Geological Survey from 1889 to 1909.

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