The Newspaper Puzzle : Solution

What was the puzzle?

If the page starts with odd number 1 & back side followed by even 2 then at the back of page number 45, there must be number 46.

Generally, for the page p, page 65 - p shares the same sheet as p. Like page 1 and 65-1 =64, page 2 and 65-2=63 page are on the same sheet.

Therefore, page 45 must be on the same sheet as 65 - 45 = 20 page number. And the page 46 must be on the same sheet as page 65 - 46 = 19.

In short, the pages 19,20,45 and 46 must be on the same sheet.