Предмет: Математика, автор: няша258

в классе 25 учеников, из них 11 мальчиков. Сколько процентов от всех учащихся класса составляют девочки? (решить двумя способами).

помогите пожалуйста!

Ответы

Автор ответа: Flokin

25-11=14 (дев)
25-100%
14-x%
x=(14*100)/25=56%
или
25 -100%
11 - х%
х=(11*100)/25=44% - мальчики
100%-44%=56% девочки

Автор ответа: DarkAngel98

1)
25 человек это 100%
11 мальчиков это x%
составим пропорцию x=11*100/25=44%
100%-44%=56% девочек
2)
25 человек всего из них 11 мальчиков значит девочек=25-11=14
25 человек это 100%
14 девочек это x%
составим пропорцию x=14*100/25=56%

Автор ответа: няша258

спасибо большое!! :))

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