Logic Puzzle

Solution

Let’s break down the family structure:

• Sally is a girl.
• She has 3 brothers.
• Each brother has 2 sisters.

Since Sally is already a girl, she counts as one sister. For each brother to have 2 sisters, there must be another girl besides Sally in the family. If there were more than 2 sisters, each brother would have more than 2 sisters.

Calculation

• Sally herself (1 sister)
• One other sister (the second sister)

So, Sally has 1 sister.

Final Answer

Sally has 1 sister.