Two children wants to share 2 3/4 sub sandwiches so that each one gets the same amount how much should each person get

5x + 2 = 12 solve the following equation. then place the correct number in the box provided.

Ihonestly have no clue if it's each or none.

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.