5.c=mdx100/ms
10=md1x100/200---> md1=20g
in a doua solutie, md este acelasi iar ms2=ms1+ m,apa
c2= 20/(200+100)=.................calculeaza
15= md1x100/150----> md1=22,5g
in a doua solutie, md2= 22,5+20 si ms2= 150+20
c2= 42,5x100/ 170=...........calculeaza !!!