Jamal has 48 clean pieces of paper and 72 used pieces of paper in his notebook. Which sentence describes the ratio of pages in Jamal’s notebook?

The ratio of clean pieces of paper to used pieces of paper is 1 : 2.

The ratio of clean pieces of paper to total pieces of paper is 2 : 3.

The ratio of used pieces of paper to clean pieces of paper is 3 : 2.

The ratio of used pieces of paper to total pieces of paper is 2 : 5.

PLEASE HELP