Crina + Radu = 234 timbre
Rezolvare algebrica
Notez c = nr. timbre Crina si r = numar timbre Radu
c + r = 234
r = 2 × c
c + 2 × c = 234
3 × c = 234
c = 234 : 3
c = 78 timbre are Crina
2 × 78 = 156 timbre are Radu
sau: 234 - 78 = 156 timbre are Radu
Metoda grafica
Crina l------l } total = 234 timbre
Radu l------l------l
234 : 3 = 78 timbre are Crina
2 × 78 = 156 timbre are Radu
Verific: 78 + 156 = 234 timbre au cei doi copii
