Предмет: Математика, автор: Аноним

Пожалуйста решите задачу

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Автор ответа: lubovlubvasil
0
После того, как 7 человек ушло со стадиона, там осталось  28-7=21(ч)
В футбол стало играть в 2 раза больше  (2х),  чем в волейбол  (х)
Получаем  2х+х=21,    3х=21,  х=7
Стало играть в волейбол 7 человек, играло первоначально   7+3=10(ч)
28-10=18(ч) - играли в футбол в 10 часов
ответ: 18 человек
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