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Can you replace the question mark with a number?

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

Correct answers: 62

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

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A cowboy rides into town on Fr...

A cowboy rides into town on Friday, stays three days and leaves on Friday how does he do it?
The horses name is Friday

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James Hardy

Born 14 May 1918; died 19 Feb 2003 at age 84.James Daniel Hardy was an American surgeon who headed teams that performed the first human lung transplant in 1963; the first animal-to-human heart transplant in 1964; and a double-lung transplant that left the heart in place in 1987. Three years before Christiaan Barnard performed the first successful human-to-human heart transplant, on 23 Jan 1964, 68-year-old Boyd Rush was admitted to the hospital. No human was heart available; Hardy decided to use the heart of a chimpanzee named Bino. The newly-transplanted heart beat on its own; but it was too small to maintain independent circulation and Rush died after 90 minutes. Hardy had to endure some severe criticism. Overall, his work helped to alter perceptions about the transplantation process.

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