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ja stosuje metode kubeczkow:
1. kubeczek - 200g 15%
2. kubeczek - 300g 20%
3. kubeczek - 200+300 = 500g x
teraz rownanie:
200*15+300*20 = 500x
3000+6000 = 500x / 500
18 = x
otrzymany roztwor ma stezenie rowne 18%
:)