OPM 1995 Problem 5

Rosa dos Ventos, Aurora Boreal and Manuela do Norte organized a competition between them last weekend, consisting of several athletics events. The winner in each test obtained $x$ points, the second placed $y$ points and the third placed $z$ points ( $x,y,z \in N$ and $x >y>z$ ). The final result of the competition, obtained by adding up the scores in each event, was Rosa had $22$ points, Manuela had $9$ points, Aurora had $9$ points. In how many tests did they compete and who came second in the high jump knowing that the Manuela won the $100$ meters and no one gave up in any race?