∅ Rezolvare :
→ a = porumbei
_____________
→ b = purcei
_____________
→ a + b = 51
a = 51 — b
______________
→ 2a + 4b = 132 ≈>
→ 2 • 51 — 2b + 4b = 132 =>
→ 2b = 132 — 102
→ 2b = 30 →
→ b = 30 : 2
→ b = 15
___________
→ a = 51 — 15
→ a = 36
____________
