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Tomorrow, I will lie

(11 votes, average: 2.45 out of 5)

August 31, 2014 by puzzler 6 Comments

James and Jonathan are liars, who lie on specific days.

James lies on Fridays, Saturdays and Sundays,
but he is honest on all other days.

Jonathan lies on Tuesdays, Wednesdays and Thursdays,
but he tells the truth on all other days.

On what day of the week would they both say “Tomorrow, I will lie.”?

Check your answer:-

Tried enough already?
ExplanationHide
Answer is Thursday

Lets say if the person is speaking truth then he must be lie on next day, but if he is lying while saying “Tomorrow i will lie” then he will speak truth on next day.

So they can say the statement only when they change their behavior on next day.

Lets prepare a table for James and Jonathan for all days

James Jonathan
Monday Truth Truth
Tuesday Truth Lie
Wednesday Truth Lie
Thursday Truth Lie
Friday Lie Truth
Saturday Lie Truth
Sunday Lie Truth

From above table

James can say the statement on Thursday and Sunday

and Jonathan can say it on Monday and Thursday.

As both of them say the statement on same day, so it must be Thursday only.

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Comments

  1. Ashutosh Ranjan says

    October 15, 2015 at 9:13 pm

    Thursday
    Because on thursday james will tell truth that he will lie on friday . whereas jonathan will lie as he lie on thurs.

    Reply
  2. honey says

    November 22, 2014 at 5:40 pm

    how

    Reply
    • Praveen Kumar says

      November 25, 2014 at 11:55 am

      On thursday , both can say the statement and there will be no contradiction. Try that.

      Reply
  3. nawabi_gabru says

    September 1, 2014 at 10:34 am

    thursday

    Reply
  4. Arvind Kale says

    September 1, 2014 at 10:08 am

    Thursday

    Reply
  5. Kunal Shrivastav says

    August 31, 2014 at 11:41 pm

    Thursday

    Reply

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