Вбаке было 8 литров 34% раствора соли. когда m литров это- го раствора заменили равным количеством 60% раствора, получился 43,75% раствор. чему равно m?
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Пишем такое уравнение смеси.
(8 - m)*34% + m*60% = 8*43.75% - запись по тексту задачи.
Упрощаем
8*0,34 + (0,6 - 0,34)*m = 8*0.4375
Ещё упрощаем
0,26*m = 8*(0,4375-0,34) = 0,0975*8 = 0,78
Находим неизвестное - m - делением
m = 0.78 : 0.26 = 3 л - заменили - ОТВЕТ