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Day-knights and night-knights 8 (Posted on 2014-03-03) 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.

Four inhabitants Art, Barry, Cole and Dan approach a visitor to the island. It is known that precisely two of them are members of the Jones family and the remaining two are members of the Smith family.

They say:

Art: Barry’s last name is Smith.
Barry: Cole belongs to the Jones family.
Cole: Art and Dan are from different families.
Dan: Art and Barry are from the same family.

What are the surnames of the three inhabitants? Is it day or night?

No Solution Yet Submitted by K Sengupta    
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Comments: ( Back to comment list | You must be logged in to post comments.)
re: W H Y ? Comment 4 of 4 |
(In reply to W H Y ? by Ady TZIDON)

Nobody caught this while in the queue.
  Posted by Charlie on 2014-03-03 13:17:40

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