Предмет: Алгебра, автор: djdima183

В сплав меди и олова содержащий 5 кг олова,добавили 15 кг меди. В результате процентное содержание меди в сплаве выросло на 30. Сколько кг меди было в первоначальном сплаве?

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Автор ответа: Rechnung

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