Răspuns:
c=mdx100/ms, unde ms=md+m,apa
md=20g
ms= md+mapa=20g+180g=200g
c= 20x100/200= 10%
ms=400g
c= 15%--->
md= cxms/100= 15x400/100g= 60g
c=30%
md=30g
ms= mdx100/c= 30x100/30g=100g
m,apa=ms-md=100g-30g=70g
Explicație:
