A Logic Puzzle About Yogurt
A knights-and-knaves puzzle where both statements already reveal that lowfat yogurt is bad.
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Free for classrooms, worksheets, slides and other non-commercial use under CC BY-NC 4.0, with credit to Ben Orlin.
Cartoon by Ben Orlin, Math with Bad Drawings. https://cartoons.mathwithbaddrawings.com/2019-03-15-a-logic-puzzle-about-yogurt/ (CC BY-NC 4.0)Transcript
[Title] "LOGIC PUZZLE!" Knaves always lie. Knights never do.
Knave: "Lowfat yogurt is a fun and tasty option!" Knight: "Lowfat yogurt is garbage water."
"They look identical. What one question can you ask to figure out what yogurt to buy?"
[Upside-down] "(Answer: Ask anything. You should already know not to buy lowfat yogurt.)"