Soja finished 2/3 of a book. She calculated that she finished 100 more pages than she has yet to read. How long is her book? Choices:
A) A)300
B) B)150
C) C)130
D) D)90
E) 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=100   1/3*x=100   x=300   So the book is 300 pages long.   300nswer is 300.
<result>A</result>
Soja finished 2/3 of a book. She calculated that she finished 100 more pages than she has yet to read. How long is her book?