ПОЖАЛУЙСТА ПОМОГИТЕ РЕШИТЬ ДАЮ 23 ОЧКА!!! Решите пожалуйста только 3.15 буду благодарен. Остальные не нужны

Which of the following contains a variable?

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.

Robert has 78 tomatoes and 56 cucumbers he wants to plant them in equal rows how many in each row