Knights and Knaves: Carol, Ivan, Dave, Olivia, and Sybil
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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 Carol, Ivan, Dave, Olivia, and Sybil.
Ivan says: "Dave is a knave and Olivia is a knave."
Dave says: "Carol is a knave or Olivia is a knave."
Olivia says: "Sybil is a knight or Carol is a knave."
Sybil says: "Dave is a knight."
The others say nothing.
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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