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We watched this thing in math class when I was little with a king, about to die and with no sons, challenges his knights to find "the fraction right after 3/4" or something like that (the fraction was probably different but there was the definiteness of "right after" or "right before"). All of his knights, being Book Dumb, go out literally looking for it (under rocks, around trees, etc.) while his math-smart advisor keeps going and coming back with numbers like 7/8, 5/6, 13/16 before he finally realizes it goes to infinite levels and there is no such fraction/number and thus gets the rights to the throne, and says that when he becomes king he's making all of the knights list all of the numbers they can find after 3/4 and whoever gets the closest to 3/4 becomes king.
The proper google-fu can probably find this but I'm probably looking up the wrong words.