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