A hundred catties of sheep can't eat more than 7.5 catties in three days. According to relevant data, 100 kg of sheep 1 day needs to eat 2.5 kg of grass, but if you don't eat it for three days, your weight will only decrease for three days, and 3 times 2.5 is 7.5 kg. Sheep is the collective name of sheep subfamily, including mammals, Artiodactyla, cattle and sheep subfamily, and it is one of human livestock.