# Seven Books

Pro Problems > Math > Algebra > Functions > Arithmetic Sequences## Seven Books

Geraldine has 7 books which she has placed in order from least number of pages to most. She notices that her books’ page counts are in arithmetic sequence. She further notices that the number of words per page decreases arithmetically from one book to the next. If the first book has 96,000 words, the last book has 123,132 words, and the middle book has 111,843 pages. Find the common difference in the sequence of the number of pages.

## Solution

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