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Day-knights and night-knights 7 (Posted on 2013-11-25) Difficulty: 3 of 5
There is a land where every inhabitant is either a day-knight or a night-knight. Day-knights tell the truth in the day and lie at night. Night-knights lie in the day and tell the truth at night.

Members of the Smith family are day-knights and members of the Jones family are night-knights.

Three inhabitants Al, Ben and Cal approach a visitor to the island. It is known that precisely two of them are members of the Jones family and the remaining one is a member of the Smith family.

They say:
Al: Ben belongs to the Jones family. 
Ben: Cal belongs to the Jones family. 
Cal: Alís surname is Smith.
What are the surnames of the three inhabitants? Is it day or night?

No Solution Yet Submitted by K Sengupta    
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  Subject Author Date
SolutionsolutionCharlie2013-11-25 14:01:08
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