Can a rectangular piece of wrapping paper with an area of 81 square inches have a perimeter of 60? (Hint: Let length=30-w.)

Yes, length=30-w and the area is 81. 81 can be divided by 9, 27, or 3. If we try substituting 3 for w, then the length (30-3=27). So the length is 27, and the width is 3. Area is length times width 27x3=81 squared inches.