Question

Calculeaza cate kg de nutret consuma fiecare animal intr-o zi daca:6 vaci si 2 oi consuma 256 kg; 9 vaci si 5 oi consuma 400 kg;

Answer 1

6v+2o=256     2o=256-6v     o=(256-6v)/2=128-3v
9v+5o=400
9v+5(128-3v)=400
9v+640-15v=400
-6v=400-640
v=240:6
v=40 kg consuma o vaca
o=128-3*40=128-120=8 kg consuma o oaie