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问题 解答题

有一片草地，草每天生长的速度相同．这片草地可供5头牛吃8天，或供14头牛吃2天．问可供8头牛吃几天？

答案

设每头牛每天吃早1份，则草每天生长：

（5×8-14×2）÷（8-2），

=（40-28）÷6，

=12÷6，

=2（份）；

原有的草量：（5-2）×8=24（份）；

8头牛吃：24÷（8-2），

=24÷6，

=4（天）；

答：可供8头牛吃4天．

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