April 2021 0 20 Report

Смешали 8 литров 15-процентного водного раствора некоторого вещества с некоторым количеством 25-процентного водного раствора этого же вещества. Сколько литров 25-процентного раствора взяли если концентрация получившегося раствора составляет 21%?

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