Chapter 35

A mathematical contest

2001 Canadian Invitational Mathematics Challenge^1

1 Thirty years ago, the ages of Xaviere, Yolanda, and Zo ̈e were in the

ratio 1:2:5. Today, the ratio of Xavior’s age to Yolanda’s age is 6:7.

What is Zo ̈e’s present age?

(^1) Grades 10 and 11;Crux Math., 29 (2003) 129–132.