ex1...1 cal mananca in 6 zile (30 zile:5cai) 180kg ovaz (900 kg:5 cai) rezulta ca intr-o zi un cal mananca 30 kg ovaz rezulta ca intr-o jumatate de zi mananca 15 kg ovaz.....12 cai manaca in 12 zile 360 kg ovaz iar in celelalte 6 zile mananca inca 180 kg ovaz (12 cai x 15 kg ovaz in jumatate de zi) in total 540 kg ovaz