What are three equivalent ratios for 18/6

If i have a 24 in loaf of bread and i cut it into two pieces one 9 in how long was the other

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.

What number gives you a irrational number when added to 2/5