It’s the Friday Puzzle!


coverPlease do NOT post your answer, but do say if you think you have solved the puzzle and how long it took. Solution on Monday.

The police know that either Dick, Jack, Sally, or Jimmy have stolen some money. Each suspects makes a statement, but only one of the statements is true.Dick said, “I didn’t do it.”
Jack said, “Dick is lying.”
Sally said, “Jack is lying.”
Jimmy said, “Jack did it.”

Who committed the crime?

I have produced an ebook containing 101 of the previous Friday Puzzles! It is called PUZZLED and is available for the Kindle(UK here and USA here) and on the iBookstore (UK here in the USA here). You can try 101 of the puzzles for free here.

50 comments on “It’s the Friday Puzzle!

  1. Roland says:

    The Butler did it 😉 Got it in a few seconds

  2. Julie C says:

    I think I’ve got it- 10 minutes

  3. Chase says:

    30 seconds to solve. 1 minute more to check everything to make sure I didn’t miss something.

  4. Father Ted says:

    The money was only resting in my account
    30 seconds

  5. Anne Elk says:

    About ten minutes… but I’m not convinced I’ve got it right.

  6. Jethro says:

    I got it fairly quickly. If you like this kind of puzzle I recommend looking up Raymond Smullyan, his book ‘What is the name of this book’ is fantastic.

  7. Carl says:

    How do Jack and Sally know what the others said in their statements? Sounds like a stitch-up.

  8. mgm75 says:

    Pretty sure I’ve got it. Took me a few minutes though…

  9. Stewart says:

    About five minutes, but if I’d used different logic I’d have got it sooner.

  10. Baker's Dozen says:

    James May would like this one.

  11. Eddie says:

    Can’t do this type of thing.

  12. Lazy T says:

    If only real life was so simple.
    How do the plods know “only one of the statements is true”? are they profiling the suspects?

  13. Marktech says:

    I’m skewing the sample, because I never comment on the ones I can’t do!

    This one: a /very/ simple insight as I read it, which made it instantly obvious.

    • Ken Haley says:

      Yes, Marktech. It’s what Martin Gardner would call an “Aha!” I hope Richard reveals the insight when he posts the solution.

  14. Anonymous says:

    Another Friday morning spent scratching my head. Is this a trick question? Is there really an answer?

  15. Hugh Jarse says:

    Viagra. The best cure for a lying Dick

  16. Danielle Kennedy says:

    Trial and error, first answer was correct in ~30 secs. Took a few mins more to show other possibilities were wrong.

  17. seamagu says:

    30 secs, maybe I’m missing something

  18. about a minuet. I’m not sure how i got there, but I have an answer.

  19. Graeme says:

    About 10 seconds. Another 10 double checking.

  20. Steve says:

    15 minutes or so to get an answer.

  21. Owl Variations says:

    I blame it on the boogie.

  22. Jethro says:

    Has anyone else noticed that you don’t need to read all of the statements to find the answer?

  23. Stuart Ferguson says:

    about 5 seconds, might have taken longer if they were written in a different order though and only needed 3 statements

  24. Anonymous says:

    10 seconds, it usually takes me about an hour so I’m quite pleased with myself today!

  25. ubi dubium says:

    About 30 seconds. But I also want to know how the police determined that one statement was actually true. I don’t trust any of them.

  26. Richard Burns says:

    I got it, took about 15 minutes.

  27. Richard says:

    I got it, about 15 minutes.

  28. Two minutes, by checking all the possible combinations. But it would have been easier if their names were Adam, Bob, Carol and Dave.

    But how do the police know that one of the four statements is true?

  29. issahamati says:

    five minutes ,but this not mean I assume I am right

  30. Good one. It took me longer than average to work out the impossibilities.

  31. dlesage says:

    35 comments, and no one has spoiled the answer yet… That’s gotta be a record.

    Or did I just jinx it?

  32. Anonymous says:

    About 30 seconds to get an answer, but I didn’t bother double-checking as everyone who does that seems to be right anyway 🙂

  33. Phil H says:

    Flounder around for 2 mins. Engage brain. Succeed in 30 seconds

  34. One Eyed Jack says:

    It was that darned sasquatch.

  35. mightyhro says:

    Got it.

  36. Anonymous says:

    have you guys seen the brain games at nat geo? I’ve seen most of their tricks and other stuff here in this site before.

  37. Miss Chili says:

    Get it? Got it? Good. 😀

  38. Jeffrey says:

    Colonel Mustard did it in the observatory with knife.

  39. Merari says:

    4 minutes with writing up the possibilities.

  40. dayuntoday says:

    Less than a minute, but another minute to double-check. Good one, though, because it’s hard to keep it all straight.

  41. Anonymous says:

    I’ve got 10 seconds to solve it

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