Knights and Knaves: Judy, Niaj, Carol, Grace, and Dave
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knights knaves
On an island, every inhabitant is either a knight, who always tells the truth, or a knave, who always lies. You meet Judy, Niaj, Carol, Grace, and Dave.
Judy says: "Grace is a knave or Carol is a knave."
Niaj says: "Judy and Dave are of different types."
Carol says: "Dave is a knight or Judy is a knave."
Grace says: "Carol is a knave and Dave is a knight."
Dave says: "Judy is a knave."
Who is a knight and who is a knave?
Hints
Hint 1
Hint 2
Hint 3
Solution
Commit an attempt to unseal the proof. Write your answer — right or wrong, thinking it through is the point.
Once you've worked out who is who: how many of the 5 inhabitants are knaves? Answer with the number.
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