Răspuns:
c= (md/ms)*100
=> md= c*ms/100
md(1)= 10*100/100= 10 g
md(2)=50*100/100=50 g
ms final= ms(1)+ms(2)
ms final= 100+100
ms final= 200
md final= md(1)+md(2)= 10+50= 60 g
c= (md final/ ms final)*100= 60*100/200=30% ( media aritmetica a conc. celor 2 solutii)