1.Ans: 272

2.Ans: 7 

3.Ans: 8712 

4.Ans: 3 to Jan 


5.Ans: 21 pounds? 

6.
6729/13458, 5823/17469, 3942/15768, 2697/13485, 2943/17658,
2394/16758, 3187/25496, 6381/57429


7.Ans: 1 apple, 2 bananas and 1 pear. 


8.Ans: They pool the money. The woman takes 74, the shopkeeper takes 109 and the customer 28. 


9.Ans: The cyclists crash after 3 hours so the bee flies 180km.


10.Ans: 97 leads to a 119 link chain. The lowest number that causes a long chain is 27 (112 links). 


11.Ans: 77 


12.Ans: Up to 8.


13.Ans: 97 


14.Ans: 23 


15.Ans: No. Just Monday, Tuesday, Thursday or Saturday. See "Mathematical Bafflers" 


16.Ans: 22


17.Ans: 364