ms1 = 500 g
c1 = 5%
c2 = 2%
ms2 = ms1 + m.apa
notam cu a = m.apa
c2 = md x / ms2 = mdx100 / ms1 + a
md = c2(ms1+a)/100 (1)
md = ms1xc1/100 (2)
=> md(1) = md(2) <=> c2(ms1+a)/100 = ms1xc1/100
=> c2(ms1+a) = ms1xc1
=> c2xms1+c2xa = ms1xc1
=> a = (ms1xc1 - c2xms1) / c2
=> a = (500x5-500x2)/2
=> a = 750 g apa
