My student had difficulty showing that 3 < A < 3.75 and I was stuck for a couple of seconds too. Reason? The question did not state clearly how many rectangles are required. The answer is 2 rectangles, but if a student used 3 or more rectangles or 2 rectangles that are different from what the setter has in mind, then they would probably not get the values 3 and 3.75.
The setter did not consider enough when setting this question.