4 models have responded to the "Logic Puzzle" challenge. Compare their approaches side-by-side on RIVAL. This response is part of RIVAL's open dataset of 5,600+ AI model responses.
Logic Puzzle
Qwen3.5 Plus 02 15's response to the 'Logic Puzzle' challenge.
?Prompt
Sally (a girl) has 3 brothers. Each brother has 2 sisters. How many sisters does Sally have?
Response
Here is the step-by-step logical deduction:
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Analyze the family structure from the brothers' perspective: The problem states that "Each brother has 2 sisters." Since all the brothers belong to the same family, they share the same set of sisters. This means there are exactly 2 girls in the entire sibling group.
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Identify the girls: We know one of the girls is Sally. Since the total number of girls is 2, the other girl must be Sally's sister.
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Calculate Sally's specific number of sisters: To find out how many sisters Sally has, we look at the total number of girls and subtract Sally herself. $$ \text{Total Girls} - \text{Sally} = \text{Sally's Sisters} $$ $$ 2 - 1 = 1 $$
Conclusion: Sally has 1 sister.
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About Qwen: Qwen3.5 Plus 2026-02-15
Capabilities
Categories
Specifications
- Provider
- Qwen
- Released
- 2026-02-16
- Size
- XLARGE
- Parameters
- Not disclosed
- Context
- 1,000,000 tokens
