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O solutie cu C=40% contine 600g apa. 
Cata sare contine solutia?



Răspuns :

c=md*100/ms
ms=mapa+md
ms=600+md
40=md*100/600+md
40md+24000=100md
24000=60md
md=400g
ms=md+mapa=400+600=1000g

Ms=600 g
C=40%
c/100=Md/Ms
40*600g/100
240g de sare au fost adaugate.