Răspuns:
se aplica formula: c= mdx100/ms, unde ms= md+m,apa
solutia 1
ms1=200g
c1=6%
md1= c1xms1/100= 6x200/100g= 12g
solutia 2
md2=md1=12g
ms2= ms1+m,apa
c2= md2x100./ms2= > 4=12x100/(200+m,apa)----> m,apa= 100g
solutia 1
ms1=400g
c1=15%
md1= 15x400/100g= 60g
solutia 2
md2=md1=60g
ms2=ms1-m,apa= 400g-100g=300g
c2= 60x100/300= 20%
solutia1
ms1=200g
c1=10%
md1= 10x200/100g= 20g
solutia 2
md2=md1+30=> 50g
ms2=ms1+30=> 230
c2= 50x100/230=21,7%
Explicație:
