Logic Puzzle

Let’s break it down step by step.

We’re told:

Sally (a girl) has 3 brothers.

So, there are 3 boys in the family, and Sally is a girl — so at least one girl.

Each brother has 2 sisters.

That means, from the perspective of each of the 3 brothers, there are 2 sisters.

Who are those sisters?

Well, Sally is definitely one of them.

Since each brother has 2 sisters, there must be one more girl besides Sally.

So, the sisters are: Sally and one other girl.

Therefore, Sally has 1 sister.

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✅ Final Answer: 1 sister

(Sally + 1 other girl = 2 sisters total, which matches what each brother sees.)