> Sally (a girl) has 3 brothers. Each brother has 2 sisters. How many sisters does Sally have? The site reports every LLM as getting this wrong. But GPT4 seems to get it right for me: > Sally has 3 brothers. Since each brother has 2 sisters and Sally is one of those sisters, the other sister is the second sister for each brother. So, Sally has 1 sister.
Also, I tend to include mention in the question that all siblings are from the same two parents to preclude half-siblings because half my friends have half-siblings from both sides scattered across the country; so the wrong answers actually do tend to apply to them sometimes.