A co-worker asked a riddle that got me wondering about the anatomy of books and book binding methods.
A leaf is torn from a paperback novel. The sum of the remaining page numbers is 15,000. What pages were torn out?
According to the answer (and a lot of the internet), it claimed that a leaf:
is a single sheet bound in a book, and a leaf has two pages.
I thought this assumption was vague and that a leaf can either have two pages or four pages depending on how it is bound. This assumption also changes the answer of the riddle.
Are both definitions of a
book leaf correct? Or is there only one? Is one more commonly assumed than the other?