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Ответ

Ответ дан
ОлькаЛелька90

Ответ:

14 учеников

Пошаговое объяснение:

Пусть Х - кол-во учеников, которые пришли, тогда имеем уравнение:

17 + Х = 31

Х = 31 - 17

Х = 14

проверка:

17 + 14 = 31

Ответ: 14 учеников пришли в зал

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