The global competition for the World Cup is
broken up into six continental zones. The
number of teams in the Australian team's zone is
three more than four times the number of teams
in the Brazilian team's zone. There is a total of
53 teams in both zones. How many teams are in
each zone? . show how you got your answer

Set $r$ is a set of rectangles such that (1) only the grid points shown here are used as vertices, (2) all sides are vertical or horizontal and (3) no two rectangles in the set are congruent. if $r$ contains the maximum possible number of rectangles given these conditions, what fraction of the rectangles in set $r$ are squares? express your answer as a common fraction.