>>> Sally has three brothers. Each of them has two sisters. How many sisters does Sally have?

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From the information provided, we know that Sally is one of the sisters to her brothers. Since each brother has two sisters, and Sally is already accounted for as one, that means she has one more sister. In total, Sally has 2 sisters.

Here's the reasoning:
1. We know that Sally is one of the sisters to her three brothers.
2. Each brother has two sisters, but we need to account for the fact that Sally has already been mentioned as one of them.
3. Therefore, there is another sister, making Sally's total number of sisters 2.

This question highlights the importance of careful reasoning when analyzing information and avoiding potential double-counting errors.