Using Times New Roman font? Here is a cheat for a higher page count
eyerys.com
eyerys.com
Alternatively, maybe ask the professor to simply invert the page requirement. In undergraduate school a writing assignment that required at least 10 pages meant a tortuous uphill battle to put words on the page. In graduate school a writing assignment that limited the page count to 10 pages or less resulted in a 20-page paper pouring out and then many hours spent paring it back. Funny how framing can have that effect.