Calculam sarea din prima solutieL
c₁ = md₁/ms₁ x100 md₁= c₁xms₁/100 md₁= 5x200/100 md₁= 10g
c = md₁+ md adaugat / (ms₁ + md adaugat) x100
20= 10+ md adaugat / (200 + md adaugat)x100
20(200 + md adaugat) = 100(10 + md adaugat)
calculam si obtinem
200 + md adaugat = 50+5 md adaugat
md adaugat =150/4 md adaugat = 37,5g sare
Pentru usurinta se poate nota md adaugat cu x!