单选题：甲乙两笼中共有鸡260只，甲笼中有13%是公鸡，乙笼中有12．5%是公鸡，那么，乙笼中有母鸡（　　）只。

题目内容：

甲乙两笼中共有鸡260只，甲笼中有13%是公鸡，乙笼中有12．5%是公鸡，那么，乙笼中有母鸡（　　）只。 A．145
B．140
C．87
D．20

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答案解析：

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