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xkg-roztworu 80%
4kg-roztworu 60%
x+4kg-roztworu 70%
Obliczenia:
80x+60*4=70(x+4)
80x+240=70x+280
80x-70x=280-240
10x=40 /:10
x=4kg
Odp.Potrzeba 4kg roztworu 80%.