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Dizolvam 25 h zahar in 375 g apa. Ce concentratie procentuala va avea solutia?

Răspuns :

md=25g                                  c=md.100:ms                                            
mapa=375g                            ms=md +mapa                
c=?                                          ms=25+375=400g                                                  c=25.100 :400=6,25 la suta