Each of the Smith brothers has as mang sisters as he has brothers.But each of the Smith sistershas twice as many brothers as she has sisters.How many sisters ang brothers are there in Smith family?————————————————————————————An animal which produes wool（） An animal which flies（）
问题描述：
Each of the Smith brothers has as mang sisters as he has brothers.But each of the Smith sistershas twice as many brothers as she has sisters.How many sisters ang brothers are there in Smith family?
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An animal which produes wool（）
An animal which flies（）
答