Sophia finished 2323 of a book. She calculated that she finished 90 more pages than she has yet to read. How long is her book?	Select:
A) 140  B) 320  C) 745  D) 270  E) 350

Rationale: let x be the total number of pages in the book , then she finished 23 ⋅ x pages . then she has x − 23 ⋅ x = 13 ⋅ xpages left . 23 ⋅ x − 13 ⋅ x = 90 13 ⋅ x = 90 x = 270 so the book is 270 pages long . correct answer is d ) 270
Answer: D