Hi. If I read a book and I'm - let's say - (roughly) on page 300 out of 600, so to speak in the middle, ...:<br/><br/>a) How do I say it correctly?<br/>b) Can I say, "I'm in/at half of the book"?<br/>c) Is saying "I'm halfway the book" possible?<br/><br/>Thank you in advance for a reply.