perplexus.info :: Logic : Day-knights and night-knights

Day-knights and night-knights (Posted on 2011-03-08)

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. One inhabitant once said, "It is day." Is the inhabitant a day-knight or a night-knight?

Submitted by Math Man

Rating: 3.0000 (1 votes)

Solution: (Hide)

If it is day, then they are telling the truth, so they are a day-knight. If it is night, then they are lying, so they are a day-knight. Either way, they are a day-knight.

Comments: ( You must be logged in to post comments.)

Subject	Author	Date
No Subject	Riley Maxted	2020-02-03 23:37:46
night and day	Ady TZIDON	2011-03-09 06:25:46
re: Solution	Dej Mar	2011-03-09 00:17:35
Solution	Kenny M	2011-03-08 21:25:39

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