Sophia finished 2/3 of a book. She calculated that she finished 90 more pages than she has yet to read. How long is her book?	Options
A) 270
B) 150
C) 130
D) 90
E) 210
Let x be the total number of pages in the book, then she finished 2/3*x pages.   Then she has x−2/3*x=1/3*x pages left.   2/3*x−1/3*x=90   1/3*x=90   x=270   So the book is 270 pages long.   270nswer is 270.
<result>A</result>
Sophia finished 2/3 of a book. She calculated that she finished 90 more pages than she has yet to read. How long is her book?