👤

3 vaci si 2 oi consuma 57 l de apa iar 5 vaci si 2 oi consuma 106 l apa....cati litrii de apa consuma zilnic o vaca si cati o oaie

Răspuns :

3v+2o=57 =>o=(57-3v)/2
5v+7o=106 =>o=(106-5v)/7
(57-3v)/2 = (106-5v)/7
2(106-5v)=7(57-3v)
212-10v=399-21v
399-212=21v-10v
187=11v =>v=17
3×17+2o=57
2o=57-51
2o=6 =>o=3