I saw the first problem in a magazine not in my textbook,so you can work it out in any ways.And thank you for your later typing.Originally Posted byCaptainBlack

The second one is from Cambridge College Math Institute and the answer to this problem will not be given untill several months later. Anyone who works it out can send email to puzzlemaster@cambridgecollege.edu with your solution.

Thank you , thank you for your thinking and typing,

and words fail me to say anything others.