notam:
roibu-r
murgu-m
balanu-b
Daca r+m+b=790kg si r+b=542kg => m+542=790=>m=790-542=248=>m=248kg
Daca m+b=535kg si m=248kg =>b=535-m=> b=535-248=287 =>b=287kg
Daca m=248kg, b=287kg si r+m+b=790kg => 248+287+r=790 => r=790-248-287=255kg
in concluzie, murgu=248kg, balanu=287kg si roibu=255kg