GPT-4.1 Mini
Let's analyze the information:
- Sally has 3 brothers.
- Each brother has 2 sisters.
Since Sally is a girl and one of the sisters, for each brother to have 2 sisters, it means there must be a total of 2 sisters in the family (including Sally).
Therefore:
- Total number of sisters = 2
- Sally is one of them
- So, Sally has 1 sister
Answer: Sally has 1 sister.







