A number of pages were torn out of a book. The pages had the following page numbers on them:
7, 8, 100, 101, 222 and 223
How many pages in total were torn from the book?
Page 1 starts on the right hand side, and page 2 is printed on the back. Therefore, any two consecutive odd-even numbered pages will fall on the same page while two consecutive even-odd pages will fall on two different consecutive pages.