Răspuns:
ms=800g
c=20%
md=160g
c2%=10%
md2=md=160g
ms2=md+m2H2O
Scot ms2
ms2=16000/10
ms2=1600g=160g+m2H2O
m2H2O=1440g
m1H2O=800g-160g=640g ptr. prima solutie
Explicație: