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Pages is not an adverb. Pages is a noun.Here is a sentence using pages: My book has 284 pages.
2500 pages are approximately 2,500 pages.
The dictionary has 1174 pages. 587 pages plus half of that (293.5) equals 880.5 total pages.
240 pages ( counting back pages and front pages) 223 pages of the story (no back and front pages)