This cross-number puzzle is one of my all-time favourites. I first came across it in a book called "Games for the Superintelligent", by James F Fixx. It looks impossible to solve, but the numbers and clues are cleverly interlocked so that by using a bit of logic, calculation and trial-and-error it can be cracked.

1. | Area in square yards of Pilgrims' Plot |

5. | Age of Martha, Farmer Dan's aunt |

6. | Difference in yards between the length and breadth of Pilgrims' Plot |

7. | Number of roods in Pilgrims' Plot times 8 down |

8. | The year Farmer Dan's family acquired Pilgrims' Plot |

10. | Farmer Dan's age |

11. | Year of Mary's birth |

14. | Perimeter in yards of Pilgrims' Plot |

15. | Cube of Farmer Dan's walking speed in mph |

16. | 15 across minus 9 down |

1. | Value in shillings per rood of Pilgrims' Plot |

2. | Square of the age of Farmer Dan's mother in law |

3. | Age of Mary, Farmer Dan's daughter |

4. | Value in pounds of Pilgrims' Plot |

6. | Age of Dan junior, Farmer Dan's son, who is twice the age of his sister Mary in 1945 |

7. | Square of the breadth of Pilgrims' Plot |

8. | Time in minutes it takes Farmer Dan to walk 1 1/3 times around Pilgrims' Plot |

9. | The number that multiplied by 10 across gives 10 down |

10. | See 9 down |

12. | Addition of the digits of 10 down plus 1 |

13. | Number of years Pilgrims' Plot has been in Farmer Dan's family |

Click here for the solution.

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