Temporary compulsive liar

Is he telling the truth? If yes then it is Monday, Thursday, or Friday. But then he must then be telling the truth on the following day. This is a contradiction because none of the days or consecutive.

Therefore, he must be lying. Which means it is Tuesday, Wednesday, Friday, or Saturday. But if this statement is a lie then he must be lying on the following day. Because the only consecutive lying days are Tuesday and Wednesday, it must the former.

It is Tuesday.

It's possible to solve this even not knowing on which days he lies and on which he tells the truth. The only additional supposition is that the riddle only has one solution.

See, if the solution was Monday, there are two other days with identical conditions (John does something and does the opposite on the next day). So none of them can be it. Same with the other three days. The only one day which is differentiable from the others is Tuesday.

As most of the days deny the following day, you need 2 consecutive days with the same status to be able to say such thing. So the answer is Tuesday

John decided to tell the truth on Mondays, Thursdays and Saturdays so the other days tuesday, wednesday, friday, and sunday John will lie. One day he said, “I will tell the truth tomorrow.” but john never say the truth thing in two days straight so I think mabye that day he was lied. When he said, “I will tell the truth tomorrow” that mean he will lie again tomorrow so the answer was Tuesday.

We could look at it as follows:

Here are the possible ways in which anybody could be truthful or lying on two consecutive days.

From this we can see right away that any combination of TL, and LT will not work since "I will tell the truth tomorrow." cannot work with contradicting days (for example for TL if he is telling truth then tomorrow being a lying day cannot satisfy this statement)

What we are left with is TT and LL as the only possibilities. since in our scenario we have only a single occurrence of LL then it must be Tuesday as the answer.

If the statement is true, then he would be telling the truth both this day and the next, which never happens. Therefore the statement must be a lie. Therefore he will lie tomorrow. The only two consecutive days he could lie are Tuesday and Wednesday, so the statement must be made on Tuesday.

I find the logic simple:

John cannot say this on a day where the next day he switches from lie to truth or vice versa because that will always contradict the statement. The only day meeting this requirement is Tuesday, so he said it on Tuesday.

Since John tells the truth on Mondays, Thursdays and Saturdays those days are automatically excused from the list, meaning that the days before those designated days are also excused as this would be telling the truth about the next day, meaning that Wednesdays, Sundays and Fridays are eliminated also. That's six days gone, how many days are in week? Seven, seven minus six is one, meaning that only one day could be the answer; Tuesday. Which is the answer as, he'll be lying about the next day which is expected as it isn't one of the three days that he's truthful on and it's the only remaining day.

Lets write down his behaviour for each day of the week (T: Truth, L: Lie)

Monday: T

Tuesday: L

Wednesday: L

Thursday: T

Friday: L

Saturday: T

Sunday: L

On the days he tells the truth, he cannot make the above statement because he does not tell the truth on consecutive days.

On the days he tells a lie, he can make the above statement only if lies the next day. Such an occurrence is only on Tuesday and therefore he can only make the above statement on a Tuesday.

The real answer is not Tuesday; only by probabilistic deduction of the multiple choices would it be the most likely correct answer. There is a contradiction.

Ladies and gentlemen, we have just gotten into a contradiction. If he is telling the truth, then he will tell the truth tomorrow. but Monday, Thursday, and Saturday are a few days apart. He must be lying. The only consecutive days of lying are Tuesday and Wednesday. So the answer is Tuesday.

Find the one with 2 days that he would lie in the center. Monday Tuesday Wednesday Thursday Friday and Saturday. There is no days where he would tell the truth 2 times in a row so you know that it is a lie. And you know he is lieing that he will tell it the next day, so that you know that the next day he would also be telling a lie. So the answer is Tuesday

If it is a Monday, Thursday, or Saturday, then he would instead say that he would lie tomorrow instead. If it is a Wednesday, Friday, or Sunday, then he would also say that he would lie tomorrow. So it is a Tuesday.

If he says the truth “I will tell the truth tomorrow” ,there should be 2 days in a row to tell the truth; x day and x+1 day, but on the week there is no such schedule of $Johny$ . So it is a lie.

But he must lie on a day that the next day is also the day he does lie, otherwise there is something wrong with the schedule.

He told it on Tuesday because that is the day when he is lying, and next day is also day of lies, so he was lying that he tells truth next day, because he knew that on next day he will also lie, and because lies are like "-" signs and two "-" gives us + (truth) telling lie on tuesday and wendsday give us next day Thursday which is day of truths.

Seriously, this idiotic logic was my key to success in this question

He tells the truth on Monday Thursday and Saturday then leaving Tuesday Wednesday Friday and Sunday as the days when he will lie so if he says “i will tell the truth tomorrow”on any of the days he tells the truth he is lying as there is atleast one day between each day he tells the truth so that would most definitely not work. Then we have the days he lies Tuesday Wednesday Friday and Sunday (This is getting a lil too long I’m sure u can work it out your self

If he is said to tell the truth on Mondays, Thursdays and Saturdays, he would have said he would lie on the following respective days. Therefore, these three days could be eliminated.

Based on the above conclusion, he must be lying. This means that he will not be telling the truth the next day. The only two consecutive days that John would lie are Tuesdays and Wednesdays. Thus, we can conclude that Tuesday is the answer.

If he was already telling the truth on Mondays, Thursdays and Saturdays,he couldn't make the statement on any of those days.It had to be on a day when he would lie and that could only be Tuesday,since Wednesday is the next day he would lie. Answer:Tuesday

Since John only tells the truth on Monday Thursday and Saturday, he must be lying when he said that he would tell the truth tomorrow because no two of his 'truthful' days are next to each other so therefore he must be saying that he would be telling the truth tomorrow on a day when the next day is also a day where he tells lies. Therefore the day must be Tuesday because the day after Tuesday is also a day that he lies on.

Since only one day is possible as solution, it could not be Monday, Thursday or Saturday because it leads to the same situation, giving multiple solutions (when today he tells the truth and tomorrow he lies).

By the same logic, it could not be Sunday, Wednesday or Friday, because it also leads to multiple solutions for the exercise (when today he lies and tomorrow tells the truth).

Since Tuesday is the only day that leads to a unique situation (when today he lies and tomorrow he lies again) it is the unique possible answer to the the Exercise .

John tells the truth = Mondays, Thursdays and Saturdays John Lies = Tuesdays, Wednesdays, Fridays and Sundays

Given the situations above, we have 7 days with most of them has a difference of two days in telling the truth or lie. Except for Tuesdays.

For John to tell the truth, he has to tell the truth the next day as well. Since there are no consecutive days on which he tells the truth, so he is telling a lie today.

Since his statement, "I will tell the truth tomorrow", is a lie, then tomorrow he will not tell the truth. The only two consecutive days he tells lies are Tuesday and Wednesday, so the answer is $\boxed{Tuesday}$ .

Nothing wrong with this problem. What, to hard for you ?

He has to lie on Tuesday because in between monday and Thursday there is a 2 day gap.

“I will tell the truth tomorrow.” this statement is either true or false.

In case it is true, it means he will tell the truth two consecutive days, which is impossible, because truth days are not connected (MO, TH, SA).

In case it is false, it means he will lie two consecutive days, which is possible (lie days are (TU, WE, FR, SU), two days are connected TU and WE. So he must have said this lie on Tuesday !

If we know that he tells the truth on Mondays, Thursdays and Saturdays, and none of those days are right before another , he couldn't lie on any of those days. That means he could've said that only on a Tuesday, Wednesday, Sunday or Friday. Since Tuesday is right before Wednesday, and he lies on Tuesday and Wednesday, he said it on a Tuesday.