What is each digit in elf plus elf equals fool?
Oh, dude, let's break this down. In "elf" plus "elf" equals "fool," each letter represents a unique digit from 0 to 9. So, technically, "e" + "l" = "f," "l" + "f" = "o," and "f" + "e" = "o." It's like a math puzzle, but with letters.