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MATH PUZZLE: Can you replace...

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

Correct answers: 60

The first user who solved this task is Alfa Omega.

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My girlfriend complained

My girlfriend complained I never took her anywhere, so we went to the Grand Canyon so she felt valley dated.

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Albert Bruce Sabin

Died 3 Mar 1993 at age 86 (born 26 Aug 1906).Polish-American physician and microbiologist best known for developing the first oral polio vaccine (1955), which was administered to millions of children in Europe, Africa, and the Americas beginning in the late 1950s. He was also known for his research in the fields of human viral diseases, toxoplasmosis, and cancer.

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