时间限制: 2s
内存限制: 192MB 提交: 4981 解决: 3121
题目描述
有一个牧场，牧场上的牧草每天都在匀速生长，这片牧场可供15头牛吃20天，或可供20头牛吃10天，那么，这片牧场每天新生的草量可供几头牛吃1天？
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