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These problems are from a very large set of questions about Liars who always lie about everything, and Knights who always tell the truth. Some questions also involve Knaves - people who strictly alternate between lying and telling the truth. (They are of course all indistinguishable from one another by outward appearance, and you must use logic to determine who's who.)
A butcher, a baker, a doctor, and a lawyer each make a statement, but only the doctor tells the truth. Their statements were:

Alice: Bob is the doctor.

Bob: Charlie is not the lawyer.

Charlie: Alice is the baker.

Dave: Today is my birthday.

What is each one's profession and is today Dave's birthday?

(Solution Posted, 2 Comments) Submitted on 2019-04-02 by Charlie   
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