好吧问答库 > 一个饲养场鸡鸭共400只,鸡与鸡鸭总数比是3:8,卖掉一些鸭后，鸭占全部鸡鸭总数的5分之2，现有几只鸭?

一个饲养场鸡鸭共400只,鸡与鸡鸭总数比是3:8,卖掉一些鸭后，鸭占全部鸡鸭总数的5分之2，现有几只鸭?

xiexie
2025年03月15日 15:27
有3个网友回答
网友（1）：

鸡与鸡鸭总数比是3:8,
则鸭子占总数的 5/8
鸭子数=400*5/8=250，
鸡的数量=400*3/8=150
设卖掉X 只鸭子，则
250-X=(400-X)*2/5
X=150
250-150=100
现有100 只鸭子。

网友（2）：

推荐答案2012-12-01 21:25鸡与鸡鸭总数比是3:8,
则鸭子占总数的 5/8
鸭子数=400*5/8=250，
鸡的数量=400*3/8=150
设卖掉X 只鸭子，则
250-X=(400-X)*2/5
X=150
250-150=100
现有100 只鸭子。

网友（3）：

鸡有400÷8×3=150
鸡数量不变，鸭：鸡=2:3，鸭现有150÷3×2=100

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