It’s the Friday Puzzle….


Today I set off on a little Paranormal Road Trip with Jon Ronson and Rebecca Watson. I will be posting about our little adventure next week, but if you want to know what we are up to the website is here.

OK, here is the puzzle. As ever, please do NOT post your answers, but do say if you think you have solved the puzzle and how long it took. Solution on Monday.

in the equation:

43 + 57 = 207

every digit is precisely one away from its true value. What is the correct sum?

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.


48 comments on “It’s the Friday Puzzle….

  1. Anonymous says:

    Wa hey! Welcome back everybody!

  2. David Fawcett says:

    Got it. Less than a minute. There aren’t that many possibilities.

    Nice one though. I suspect it will trip a few people up.,

  3. sirkitkat says:

    Done, 1 minute

  4. Justin says:

    A minute or two.

  5. Simon Taylor says:

    1 minute, most taken working out the wording!

  6. laconicsax says:

    About a minute. It helps that there aren’t many possibilities.

  7. Tom G says:

    Got it on the first attempt, now for the rest of the day!

  8. Anonymous says:

    This one is a bit easier than the visual “puzzles”

  9. Goliath says:

    Trial and error… where’s the puzzle piece?

    • David Fawcett says:

      The ‘puzzle piece’ is finding a more efficient method than trial and error.

    • The Masked Twit says:

      I used some logic to reduce the amount of trial and error.

      Took me about a minute.


      In homage to Richard’s answer to last week’s puzzle, however , I have “declared” the correct answer to be 3 animals and a gold coin dipped in parafin. I will accept no alternative answers whatsoever.

  10. Alistair says:

    Not that much trial and error. I liked it. No sneaky lateral thinking required. A couple of minutes.

  11. Indy says:

    I’m an idiot- it took me a couple of minutes because at first I ignored a digit… weird huh?

  12. Mick says:

    got it, 2 min, nice that comments are back.

  13. elsiem says:

    About two minutes for me too, the first spent wildly guessing, the second writing out all the possibilities, after which I spotted the correct one right away.

  14. Anonymous says:

    I wrote down all possibilities and then i choosed correct answer using windows calculator 😉

  15. Niva says:

    A couple of minutes to reason it out without guessing. Nice little exercise.

  16. Berhard says:

    under a minute… but nice

  17. Anonymous says:

    Under a minute. There aren’t mant possibilities. I always love the Friday puzzles but I prefer it when you have to do a bit of lateral thinkng!

  18. Lazy T says:

    wrote it down, thunkabit,, wrote answer – 1min 58sec

  19. Anonymous says:

    about a minute. the ‘One way’ typo didn’t help

  20. Liam Ashby says:

    Under a minute too…was pleased with myself but that seems fairly average!

  21. Spinoza B says:

    1 minute

  22. Anonymous says:

    Very straightforward… about 30 seconds

  23. Rafael says:

    relatively simple, about 30 seconds

  24. Wolf Martinus says:

    As a non-native speaker it took me about a minute to meditate over a meaning of ” one way from ” that is not related to transportation tickets. Then, assuming it means “+-1 away from the correct numerical value of the digit” – about 10 seconds.

  25. Anonymous says:

    Less than a minute.

  26. Johnny says:

    45 seconds, where each digit is one away from the actual time.

  27. Anonymous says:

    A bit too easy? Nice to have a clear answer for a change though.

  28. deepfield says:

    Brute force (mostly to see whether there were more than one answer). About 10 minutes.

  29. anonymous says:

    Bit too easy. Got your number!

  30. Penny Walker says:

    v, quick and logical. Hope I haven’t made a schoolgirl error.

  31. marycanada FCD says:

    Good one!

  32. Chris says:

    Well, I got the/an answer in under a minute but I’m not sure I did it in the most efficient manner. I applied the trial and error, suck it and see, stab in the dark, wet finger, run it up the flagpole (etc.) approach. Someone of a more mathematical bent may have seen an easier way with some fancy-schmancy formula but where’s the fun in that?

  33. Took only a few seconds, rather easier than anticipated

  34. Anonymous says:

    Easier than it appears at first glance. Less than a minute.

  35. Martha says:

    That one was EASY!!!

  36. Paul Murray says:

    A minute. The sum of the ones digits is three away from the ones digits in the solution, so there’s only one way to adjust them all to make them match.

  37. Timdifano says:

    Took about a minute, started writing it down then realised there was no need,

  38. About a minute. I started at the units digit; everything else followed easily.

  39. Cuda says:

    took ablout a minute. started with digits, after that was simple

  40. Hal Harris says:

    I like this one. Not too hard, and could actually be done by children.

  41. lamanga2004 says:

    Lazy T – are you trying to show off on the internet?

  42. Carl says:

    Not that difficult, but a nice, interesting puzzle nevertheless.

  43. The Moron says:

    Is it too late to post a spoiler now?

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