Brain Teasers
Brain Teasers Trivia Mentalrobics Games Community
Personal Links
Submit a Teaser
Your Favorites
Your Watchlist
Browse Teasers


Daily Teasers
Search Teasers

Advanced Search
More ways to get Braingle...


Logic puzzles require you to think. You will have to be logical in your reasoning.


Puzzle ID:#39000
Fun:*** (2.97)
Difficulty:*** (2.16)
Submitted By:grilledcheese*




A vacationing family sitting around the campfire has the following conversation:

1. Father: What day is it? I am sure it isn't Tuesday, Wednesday or Thursday.
2. Mother: Well that's not very helpful dear. Besides yesterday was Friday.
3. Father: No, now that I think about it, yesterday wasn't Friday, tomorrow is Friday.
4. Jon: The day after tomorrow is Thursday.
5. Meg: You are nuts. Tomorrow is Thursday.
6. Mother: Actually, it's probably Thursday today.
7. Jon: All we know for sure is that it wasn't Sunday yesterday.

If only one statement above is true, what day of the week is it?


Number each person's statement and write down the list of days that it could be according to each statement.

1. Monday, Friday, Saturday, Sunday
2. Saturday
3. Thursday
4. Tuesday
5. Wednesday
6. Thursday
7. Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday

The only day mentioned one time is Monday. Therefore it must be Monday, otherwise one of the other statements would be true.


What Next?


See another brain teaser just like this one...

Or, just get a random brain teaser

If you become a registered user you can vote on this brain teaser, keep track of
which ones you have seen, and even make your own.



Oct 29, 2007

WOO! I got it I'm a very lucky guesser
Oct 29, 2007

It's a bit easy but well done very interesteresting the way you used people instead of just numbering the staments like:
1.Yesterday wasn't friday

Oct 30, 2007

Fun teaser!
(user deleted)
Nov 02, 2007

It was kind of Silly. But interesting nonetheless!
Nov 05, 2007

Nov 08, 2007

Great teaser!

Dec 04, 2007

fun teaser i actually got it right
Dec 31, 2007

I'd think that the inclusion of "probably" in statement 6 would make that statement useless, because if that is the true statement, it doesn't necessarily mean that it is Thursday, it just *probably* is. This doesn't affect the answer though, and it's a good teaser.
Dec 31, 2007

it was fun and i got it right
Dec 31, 2007

Nice one!
Dec 31, 2007

Very nice. I misread the last statement as saying it was Sunday for some reason, which screwed up my answer.
Dec 31, 2007

Whoops, I meant I read it as saying that it isn't Sunday TODAY.
Dec 31, 2007

Good teaser. I got it but had to work at it a while.
Dec 31, 2007

Dec 31, 2007

Ummm I have a problem with this...

1. it isn't Tuesday, Wednesday or Thursday. (meaning it could be Monday today)

7. it wasn't Sunday yesterday. (meaning it could be Monday today)
Dec 31, 2007

It wasn't Sunday yesterday = it ISN'T Monday today
Dec 31, 2007

I agree with Jimbooth. Good teaser, especially for a Monday morning.
Dec 31, 2007

Dec 31, 2007

And to think I did it the hard way!
(user deleted)
Dec 31, 2007

If you run through the arguments Wednesday works aswell. Clue number 7 is true and all the others are false...
Dec 31, 2007

good one for hermione, but I'm Ron..
Dec 31, 2007

I kinda like this one. I just went on the idea of this: If (1) is true, that means (2) is false, not Saturday, (3) is false, not Thursday, (4) is false, not Tuesday, (5) is false, not Wednesday, (6) is false, not Thursday, (7) is false, not Sunday Tuesday Wednesday Thursday Friday Saturday. Which eliminates all except Monday.

Make another one, but with days of the month :-D
Dec 31, 2007

I just looked at the last thing someone said and I am just like, Monday. I am so good. good teaser grilledcheese!
Dec 31, 2007


If clue 7 is true, then clue 5 is false. If 5 is false, then tomorrow is not Thursday. If tomorrow is not Thursday, than today is not Wednesday.
Dec 31, 2007

I liked it, but... I think there's a loophole somewhere. I have to go through it again. I'm sorry to say that when i don't know exactly, but I have a feeling that there's a leak somewhere... I actually got Wednesday, like the person above said, so I'm wondering... anyway, I'm probably wrong, I know that, but I will check it out and if I'm right I'll post again, otherwise, I'm wrong. But either way, I still enjoyed it very much, and I hope you do some more similar ones. Really the best ones are the ones where you have to keep checking it because it's a REAL TEASER!

Dec 31, 2007

I may have lost it. But which sentence mentioned Monday at all.
It says Monday was only mentioned once??

Have I lost it? Don't get it at all!!

Dec 31, 2007

Me again, which is the True
statement. I am lost on this one.
Have had lots of tea.

Happy New Year All!!!!
Dec 31, 2007

Rose again. Which is the only true statement?? Is it in the figuring
out part? I just don't get it.

Dec 31, 2007

Sorry, the 2nd posting didn't show up right away. So thought it didn't take & wrote again. Did not mean
to post 3 times Now it is 4.
Sorry again
Dec 31, 2007

7. All I know for sure is it wasn't Sunday yesterday. Isn't that saying it can't be Monday? Confused.
Dec 31, 2007

Well you didn't get me that time. I read that sucker through three times. The only answer I came up with was Monday. Thanks for the teaser. Very fun.

Dec 31, 2007

Great teaser!
Dec 31, 2007

The only true statement:

I'm confuddled. Know how it feels, though! HAPPY NEW YEAR!!!
Dec 31, 2007

Bit easy but fun. You only really need to look at No. 7 as this covers every day but monday.
Dec 31, 2007

SOMEBODY, Get those people a calendar!!!!

(Tricky comprehension problems are not my forte.)
Jan 01, 2008

Sorry, couldn't get this one, didn't even try, not at my present stage of recovery (from last night's partying!). But still, very clever teaser, makes me wish I had waited till tomorrow to check my email!!!
Jan 02, 2008

i didnt get it either... did exactly what the answer said and labeled the possibilities... then read statement #7 and said well it cant be monday according to that statement... but it is monday... how???
Jan 03, 2008

What a vacationl. Any day is a good day but Monday so it had to be Monday. Great teaser there grilledcheese.
Jan 04, 2008

Fantastic teaser, even though I missed it
May 14, 2008

This teaser has a fallacy. Either clue 2 or 3 must be true, because they contradict each other if both are false. Read carefully! Clue 2 states yesterday WAS Friday (i.e. it is Thursday). Clue 3 states yesterday WASN'T Friday (i.e. it is NOT Thursday). It cannot be both Thursday and not Thursday (if both were false). However, having either clue 2 or 3 as true is contradicted by other statements being false. Clue 2 cannot be true because then clue 1 is also true (if it is Saturday, that is also not Tuesday, Wednesday, or Thursday). Clue 3 cannot be true because then clue 6 is also true (they both imply that it is Thursday). However, as another commentor stated, the word "probably" makes clue 6 useless because it cannot be true or false. If the phrase "yesterday wasn't Friday" is removed from clue 3, I would agree that the answer is Monday.
Oct 31, 2010

Fun but hard! Good job!
Dec 31, 2010

Nice one!
Dec 31, 2010

Fun! Took a bit of thinking but was a great teaser!
Dec 31, 2010

I had a sense that it was Monday due to its scarcity, but I couldn't really put my finger on the exact reasoning. I had to check out the explanation a couple of times before I could go 'yes, I see.' Phew!
Dec 31, 2010

Very nice
Dec 31, 2010

this was a good teaser but as some have pointed out, the wording is problematic in some places. The correct, "one true statement" is statement 1. However, the way the clues are written, statements 2 and 3 contradict each other so one must be true and one must be false. Unless you read it as saying, since the father comes directly after the mother, "you are wrong mother to say yesterday was friday (= yesterday wasn't friday) in fact, tomorrow is friday; so that the only statement he is asserting in clue three is there tomorrow is friday.
To have the father say "he is sure..." in clue one for it to be false means "he isn't sure" not that it is definitively not the case. Likewise, clue six, the falsification of "probably" is "probably not" not definitively not.
So, good teaser, it was creatively written but in the future use more precise language.
Jan 03, 2012

only one statement should be true.. but when the Father said that it wasn't Tue Wed, or Thurs. if that was true, then it should be Mon, Fri, Sat, or Sun. And the Mother's statement states that it was saturday that day. so both of their statements support each other... so both of them should be lies if there should only be one statement that is true.
Feb 23, 2013

Honestly, I found this pretty annoying because of the way its written. Statement 3 says: "No, now that I think about it, yesterday wasn't Friday, tomorrow is Friday." If 1 is true, then 3 is false.

Statement 3 countered is "Yesterday WAS Friday, tomorrow IS NOT Friday."- which would make it Saturday today, not Monday. Leading to an impossible event. When you say a statement is false, the WHOLE statement is false. I think this teaser needs to be rewritten. I appreciate the effort but to be honest, I don't like this one at all. Not because I didn't get it, but because I think it's wrongly worded.
Dec 31, 2013

Well, I finally got one of these. I don't usually try them, but am pleased that I did.
Dec 31, 2013

I enjoyed this one, but am not sure where all the confusion is coming from on this teaser. It is (to me anyway) quite straightforward and solvable. It is just not one that can be solved instantly. If you take the time to sit and work through each statement you can get it with relative ease.
Dec 31, 2013

I had absolutely no problems with this. There is nothing about statements 2 or 3 that prevents you from getting to the correct answer as they are both false about Monday, along with every other statement except 1; which, was what the question was asking for.
Dec 31, 2016

I usually love this type of puzzle, but today found it way too challenging. I'm going to read it again later when I've had my coffee. I ALWAYS love the comments and there are some good ones included here! Wishing everyone a very happy new year! Wishing you good health, love and happiness!!

Back to Top

Users in Chat : mirabill 

Online Now: 5 users and 501 guests

Copyright © 1999-2016 | Updates | FAQ | RSS | Widgets | Links | Green | Subscribe | Contact | Privacy | Conditions | Advertise

Custom Search

Sign In A Create a free account