It's a quantity. However, the aspect ratio of US Letter paper, 8.5/11 is a ratio. If you used a copier to reduce a US Letter page by 50%, it would still have th

It's a quantity. However, the aspect ratio of US Letter paper, 8.5/11 is a ratio. If you used a copier to reduce a US Letter page by 50%, it would still have the same aspect ratio.