A careful rancher discovered that the food intake of a cow is equal to the sum of the food intake of a sheep and a goose. It is known that the feed in the pasture increases uniformly. The current feed in the pasture can feed a cow and a sheep for 45 days, or feed a cow and a goose for 60 days, or feed a sheep and a goose for 90 days. So how many days can the current feed reserve of the pasture feed a cow, a sheep and a goose?
一个细心的牧场主发现，一头奶牛的食量等于一只羊与一只鹅的食量之和．已知牧场内的饲料均匀增加，牧场现在的饲料能养活一头奶牛和一只羊45天，或养活一头奶牛和一只鹅60天，或养活一只羊和一只鹅90天．那么牧场现在的饲料储备能养活一头奶牛、一只羊和一只鹅多少天．
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