SE APLICA REALATIA
c= mdx100/ ms, ms= md+m,apa
1 .25/100= md/(md+90)..................calculeaza
2 md=m,s-m,a ---> md=320-80=>240g
c= 240x100/320=...........................calculeaza
3.ms= md+ma; ms= 170+18,2=>=188,2g
c= 170x100/188,2=.........................calculeaza