Question 1172417
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You will learn NOTHING solving such "problems".


And anybody will learn nothing from it . . . 



It is why I avoid to touch to such gibberish.



. . . . . . . . . 



Can not imagine a professional teacher, who gives such problems to his (or her) students . . . 




There is only one situation where it works.


It is when a substitute teacher comes to the class to substitute a real teacher,  without knowing the subject of the lesson.


Then he can give such a  "problem"  with the only goal  "to win a time".