July 2022 1 9 Report
В сплаве меди и цинка содержится 20 кг цинка. Когда к сплаву добавили 10 кг цинка, его процентное содержание увеличилось на 10%. Найдите первоначальную массу сплава, если она меньше 50 кг.
Подробно объясните, плез. 30 баллов
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