Răspuns:
v,s=275ml
ro=1g/ml----> ms= ro x v,s=275g
md=25g
c=mdx100/ms=25x100/275%=9%
md=200g
ms=md+m,apa= 200+400=>600g
c= 20x100/600%=3,33%
md=24g
ms=80g
c= 24x100/80%=30%
Explicație:
