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Masa soli;
3kg-100%
x-40%
x=3*40:100=1,2kg
Masa wody:
3-1,2=2,8kg
Masa roztworu po dolaniu:3=5=8kg
Stężenie procentowe nowego roztworu:
8kg-100%
1,2-x
x=1,2*100:8= 15%