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33 Math Puzzles (with Answers) to Test Your Smarts
(Hint: It's "time" for some hard math puzzles.) Answer: 11. Replace the compass rose with a clock on military time. The red tip of the compass needle points to the hour in the afternoon from 13 to ...
New Scientist6d
Maths quirk explains why crosswords are so hard – until they aren't
The process of solving a crossword puzzle is mathematically similar to well-studied physical systems – but one property makes ...