A girl has brothers and sisters.she has as many brothers as she has sisters.her brothers twice as many sisters as he has brothers.How many children?

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A girl has brothers and sisters.she has as many brothers as she has sisters.her brothers twice as many sisters as he has brothers.How many children?
A girl has brothers and sisters.
she has as many brothers as she has sisters.
her brothers twice as many sisters as he has brothers.
How many children?

A girl has brothers and sisters.she has as many brothers as she has sisters.her brothers twice as many sisters as he has brothers.How many children?
题目:一个女孩有兄弟和姐妹若干
她的兄弟和姐妹数量一样多
她的兄弟所有的姐妹是每个兄弟所有兄弟的数量的两倍
一共有多少孩子?
设这个女孩有x个兄弟,x个姐妹,则x+1=2(x-1),所以x=3
一共有7个孩子

4个

设有N男和(N+1)女
则2(N-1)=(N+1)
解得N=3
所以共7个孩子。
不知道你有没要求英文作答。另外,题目好像有语法错误,按照我的理解就是这样做。

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