Предмет: Математика, автор: soniavolkotrub

196 быстрей помогите !!!!

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Автор ответа: istratova1951

Ответ:

Пошаговое объяснение:

Девочек 3х, мальчиков х.

3 х + х = 84

4х = 84

х = 21

Автор ответа: rudakovalilia157

Ответ:

3х+х=84

4х=84

х=84/4=21

21×3=63-мальчиков участвовало

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