Due to age Roth the water level of a pond is 6 1/2 feet below normal level after a rainy month the ponds water level rose 3 1/4 feet where is the ponds current water level in revolution to its normal water level?

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.