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8 vaci si 12 oi consuma zilnic 116 l de apa ,iar 3 vaci si 12 oi consuma 66 l. Cati litri consuma o vaca si o oaie?

Răspuns :

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