Предмет: Математика, автор: кэт578

в 450 кг руды содержится 67,5 кг меди. Сколько процентов меди содержится в руде? помогите нужно срочно

Ответы

Автор ответа: Veta4732

4

Решай по методу пропорции:
450 кг - 100%
67,5 кг - x%
перемножаешь крайние и делишь на оставшееся, то есть:
67,5 * 100 / 450 = 15%
Ответ: 15%

Автор ответа: 168ксен

1

450:100=4,5-1%
67,5:4,5=15%

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