July 2022 1 10 Report

В раствор объёмом 8л, содержащей 60% кислоты, вливают раствор, содержащий 20% кислоты. Сколько нужно влить второго раствора в первый, что бы смесь содержала кислоты не меньше 30% и не больше 40%

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