Payal finished 2/3 of a book. She calculated that she finished 20 more pages than she has yet to read. How long is her book?  Choose the correct choice from the following choices
A) 60
B) 150
C) 130
D) 90
E) 210

Rationale: 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 = 20 1 / 3 * x = 20 x = 60 so the book is 270 pages long . answer is a .
Answer: A