Răspuns:
relatia folosita c=mdx100/ms
c3=md3x100/ms3, unde md3=md1+md2
ms3=ms1+ms2
ms1=65g
c1=28% md1=c1xms1/100g= 18,2g
ms2=115g
c2=68% md2= 68x115/100g=78,2g
md3= 96,4g
ms3= 180g
c3= 96,4x100/180=53,5%...................valoare cuprinsa intre c1 si c2 !
Explicație:
