Logic Puzzle

We are told:

• Sally has 3 brothers.
• Each brother has 2 sisters.

We need to find: How many sisters does Sally have?

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Let’s think carefully.

Sally is a girl, and she has 3 brothers. So the family has at least Sally + 3 brothers = 4 children so far.

Now, each brother has 2 sisters.

Who are those 2 sisters?

One of them is Sally. The other must be another girl — because if each brother has only 2 sisters, and Sally is one, then there must be one more sister.

So total sisters = Sally + 1 other girl = 2 sisters.

Therefore, Sally has 1 sister.

Wait — let’s check this again.

If there are 2 sisters total in the family, and Sally is one of them, then she has 1 sister.

And each brother has 2 sisters: Sally and the other girl. That matches.

So:

• Total children: Sally, 1 other sister, and 3 brothers → 5 children.
• Each brother has 2 sisters → correct.
• Sally has 1 sister.

✅ So the answer is: 1 sister.

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Answer: Sally has 1 sister.