Bookworm
Most people do not get this one right. On the left we see that our
bookworm
does not eat any of the pages of the first and last volumes, because
page 1 of
the first volume is on the side toward the other nine volumes, and
similarly,
the last page of the last volume is on the side toward the other nine
volumes.
So our bookworm eats through eight entire volumes, and two covers, or
41 cm.