r + g = 425
g + c = 297
r + c = 210
---------------- Adunam toate ecuatiile
2r + 2g + 2c = 932 | :2
===============================
r + g + c = 466 pasari in total
r + g = 425
----------------scadem ecuatiile
\ + \ + c = 41 de curci
===============================
r + g + c = 466 pasari in total
g + c = 297----------------scadem ecuatiile
r + \ + \ = 169 de rate
===============================
r + g + c = 466 pasari in total
r + c = 210
----------------scadem ecuatiile
\ + g + \ = 256 de gaste