scriem datele : ms1=300g
c1=25%
ms2=600g
c2=50%
c final=?
c%= [tex] \frac{md*100}{ms} [/tex]⇒md=[tex] \frac{c *ms}{100} [/tex]⇒md1=[tex] \frac{25*300}{100} [/tex]=75 g
md2=[tex] \frac{50*600}{100} [/tex]=300g
md final =md1+md2⇒md final=75+300=375g
ms final =ms1+ms2⇒ms final=300+600=900g
c% final = md final* 100/ms final⇒ c% final=[tex] \frac{375*100}{900} [/tex]= 41,66%