Logic Puzzle

Claude Opus 4.1's response to the 'Logic Puzzle' challenge.

Claude Opus 4.1

August 5, 2025

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Prompt

Sally (a girl) has 3 brothers. Each brother has 2 sisters. How many sisters does Sally have?

Claude Opus 4.1Logic Puzzle

Claude Opus 4.1

Let me work through this step-by-step.

Sally has 3 brothers.

Each of Sally's brothers has 2 sisters.

Since Sally is a girl, she is one of the sisters that each brother has.

If each brother has 2 sisters total, and Sally is one of them, then there must be 1 other sister besides Sally.

Therefore, Sally has 1 sister.

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