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500 de grame solutie de concentratie 12% se mai adauga 30 grame de substanta

Răspuns :

c = md*100/ms
md1 = 500*12/100 = 60 g
md2 = md1 + 30 = 60+30 = 90 g
ms2 = ms1+30 = 500+30 = 530 g
c2 = 90*100/530 = 16,98%