August 2022 1 9 Report

Имеется два куска сплава олова и свинца.Первый, массой 3 кг, содержит 40 процентов олова, а второй-60 процентов.Сколько второго сплава надо добавить к первому, чтобы получить сплав, содержащий 45 процентов олова?

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