Here are some questions/comments/typos on a few of the puzzles (Hakan Kjellerstrand):


* Puzzle 11. A square family
  You only mention the first solution of this puzzle (as does Dudeney), but there's another "reasonable" solution as well, namely to multiply all ages by 2:
  ages = [4,10,16,22,28,34,40,46,52] and 96

* Puzzle 15. The arithmetical cabby
  There's a typo at page 30: The next such number is 1441 (not 1331). Both my Picat model and running Mace4 confirm it's 1441.


* Puzzle 58. Secret Santa
  Page 125:
  In the solution matrix the names of Cody and Riley should be exchanged.
    - It's Cody that's 23 years old, not Riley (clue 1)
    - Riley is the one with the book, not Cody (clue 2)

* Puzzle 60. Passengers in a railroad compartment
  Page 128:
  The puzzle description states that this is puzzle number 256 in Kordemsky.
  It should be puzzle number 265.

* Puzzle 74. Married people do not lie
  The given solution is that Chandler and Ross are married.
   But I think that there's another solution as well: That only Chandler is married. 

   The reason Mace4 only gives one solution is this encoding of  Ross' statement (page 166):
    "Rachel and I have different marital status".
       m(ross)     <-> (married(rachel) -> -married(ross)).
   I would rather encode it as    
       m(ross)     <-> ( married(rachel) <-> -married(ross) ).

   Given that encoding, then the Mace4 model also yields the solution that only Chandler is married.