What is a puzzle?

“A puzzle is a problem that is fun to solve and has a right answer.” – Scott Kim, Puzzlemaster

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Math, As It Is

Knights

Multiply the number of legs by the number of tails and subtract the number of heads.

Attention: Each knight still has a head and no tails.

Solution.

It is a joke, however there are so many meaningless tasks that math books and teachers give students.