#124 Next-door jackdaws
Four jackdaws, Aak, Bik, Crawk and Deek, all live close to the edge of Tree Cherry Plain. Each has a nest containing 10 silver rings that they have stolen from local houses.
However, being untrustworthy neighbours, they also like to pilfer from each other.
On Monday, Aak steals some rings (call the number K) from Crawk. On Tuesday, Crawk takes L from Bik. On Wednesday, Deek steals M from Crawk. On Thursday, Deek takes N from Bik. On Friday, Aak removes L from Deek. Finally, on Saturday, Bik flies off with M from Aak.
This leaves Aak with 15, Bik with 1, Crawk with 11 and Deek with 13. The values K, L, M and N are all different numbers in the range 1-9. What are their values?
#123 Cara鈥檚 fleet of cars
Solution
Fifteen cars can be placed in the order: 7, 56, 8, 4, 52, 2, 54, 9, 3, 6, 60, 10, 5, 55, 11.
Here鈥檚 a diagram showing all the possible connections:
Quick quiz #112
1 Which element has an atomic number of 24?
2 In geology, what is a varve?
3 On which planet in our solar system would you find a persistent, hexagonal cloud pattern?
4 What name is given to the study of abnormalities in an organism鈥檚 physiological development?
5 What does JPEG stand for?
Answers on page 55
Answers
1 Chromium
2 A pair of layers of sediment or sedimentary rock, representing a year鈥檚 worth of deposits
3 Saturn
4 Teratology
5 Joint Photographic Experts Group