Please help. I am doing some revsion and I dont know how to answer this question.

Here is the question:

3/4 of a packet of biscuts are left in the cupboard. You decided tp eat 2/3 of the biscuts left in the cupboard. How much of the whole packet of biscuits did you eat?

Thanks to whom ever answers

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.