Maths and Logic Puzzles

I absolutely adore a good maths puzzle or a logic puzzle. This page is a collection of some of my favourites that I have complied over the years. 

Some you will know, but hopefully some you will not. Many come from the outstanding Numberplay Blog from the New York Times.

1. The Circle of Death

2. The 4 Coins Problem

3. The Wedding Ring

4. The Averages Problem

5. Avoiding the Troll

6. Ali Baba's Cave

7. Drinking Game Puzzle

8. The Raja's Pearls

9. The St Petersburg Lottery

10. Cheryl's Birthday

11. Ages of Children

12. Band around the Earth

13. The School Lockers

15. Half an Egg

16. Make 6

17. Three Liars Tossing a Coin

18. Free the Prisoners

19. Burning Ropes to Measure Time

20. Minimum Number of Aircraft

21. Minimum Number of Weights

22. Relatively Prime Bet

23. Crossing the Bridge

24. 25 Horses, 5 Tracks

25. Flipping Coins Puzzle

26. Random Airplane Seats

27. Proportion of Girls and Boys

28. The Hats and the Monster

29. Eggs from a Building

30. Five Pirates, 100 Gold Coins

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