一道脑筋急转弯……Uncle zhang has nine sons.Each son has a sister.How many children has Uncle zhang?

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一道脑筋急转弯……
Uncle zhang has nine sons.Each son has a sister.How many children has Uncle zhang?

Uncle zhang have ten children, sister is the same, because each son nine sons and a sister, a total of ten.
张叔叔有十个孩子,因为每个儿子的妹妹是同一个,九个儿子加上一个妹妹一共十个.
好累啊,不过希望能帮到你,谢谢!