August 2022 1 14 Report
Из двух растворов была сделана смесь.Первый раствор массой в 500 г и концентрацией 22%.Второй раствор массой 300 г и концентрацией 30%.Сколько процентов
концентрация у смеси сделанной из этих двух растворов?
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