作业帮英语数学题（要算式）there are four girls and two boys at different age
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英语数学题（要算式）
there are four girls and two boys at different ages,the oldest is thirteen ,while the youngest is seven ;the oldest girl is four years older than the youngest boy ,the oldest boy is four years older than the youngest girl ,so how old is the oldest boy
there are four girls and two boys at different ages,the oldest is thirteen ,while the youngest is seven ;the oldest girl is four years older than the youngest boy ,the oldest boy is four years older than the youngest girl ,so how old is the oldest boy
有年龄各不相同的四个女孩和两个男孩.最大的13岁,最小的7岁,最大的女孩比最小的男孩大4岁,最大的男孩比最小的女孩大4岁,问最大的男孩几岁?
若最小的是男孩7岁,则最大的女孩11岁,那么最大的男孩13岁,最小的女孩9岁.因为有4个女孩,年龄各不相同,而9、10、11只能是三个女孩的年龄.与题不符.
所以最小的应该是女孩,年龄7岁,最大的男孩比最小的女孩大4岁,所以,最大的男孩有11岁.
若最小的是男孩7岁,则最大的女孩11岁,那么最大的男孩13岁,最小的女孩9岁.因为有4个女孩,年龄各不相同,而9、10、11只能是三个女孩的年龄.与题不符.
所以最小的应该是女孩,年龄7岁,最大的男孩比最小的女孩大4岁,所以,最大的男孩有11岁.
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