Răspuns:
apa are densitatea 1g/ml, deci daca calculez masa ,voi stii volumul
c= mdx100/ms unde ms= md+m,apa
md=6g
c=8%
ms=mdx100/c= 6x100/8g=75g
m,apa= ms-md= 75g-6g= 69g----> v= 69ml
md=200g
c=5%
ms= 200x100/5g= 4000g
m,apa=4000g-200g=3800g----> v= 3800ml
md=50g
c=10%
ms= 50x100/10g= 500g
m,apa=500g-50g= 450g----> v= 450ml
Explicație: