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m00nsome

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To solve this problem, we need to understand the relationships between Sally and her siblings.

Given information: - Sally (a girl) has 3 brothers. - Each brother has 2 sisters.

Since Sally is a girl, and she has 3 brothers, it means that each of her brothers considers her as one of their sisters.

Therefore, if each brother has 2 sisters, and Sally is one of those sisters for each brother, then Sally has 1 other sister besides herself.

So, the number of sisters Sally has is 1.

- from Sonnet