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Must Waste More Time...
Задача. Пифагор на вопросы о числе учеников, посещающих его школу, ответил по преданию так: "Половина учеников изучает математику, четверть музыку, седьмая часть пребывает молчании. Остальную часть составляют 3 девы. Сколько было учеников у Пифагора.
Пусть х - количество учеников.
Тогда математику изучают х/2 учеников, х/4 изучают музыку , х/7 пребывает в молчании , остальные 3 человека - девы.
Составим уравнение .
ответ: 28 учеников было у Пифагора .
P.S. У вас описка в условии. Не 5 женщин, а 3 по преданию. Если будет 5, то уравнение будет иметь вид 3х=140, и при делении 140 на 3 не получим целое число х .
Не может количество человек быть дробным числом , значит описка в условии .
я не зна