Răspuns:
se utilizeaza relatia c=mdx100/ms, din care md= cxms/100
c1=14%----> md1= 14ms1/100
c2=25% ---> md2=25ms2/100
ms1/ms2= 1/2=====> ms2=2ms1
c3 =md3x100.ms3 unde md3= md1+md2
=0,14ms1 +0,25ms2
ms3=ms1+ms2
= ms1+2ms1
md3=0,14ms1+0,25x2ms1=0,64ms1
ms3=3ms1
c3= 0,64ms1x100/3ms1=21,3%
Explicație: