8 vaci.....12 oi.......116 l
3 vaci......12 oi........66 l
_________________ ( - )
5 vaci........//............50 l
Aflam cati litri consuma o vaca
50:5 = 10 l
Aflam cati litri consuma 8 vaci
8×10 = 80 l
Aflam cati litri consuma o oaie
(116-80):12 = 36:12 = 3 l