text: You are a math expert with clear and concise reasoning. Solve this problem step-by-step and box your final numerical answer:
  There are 60 pages in a manual, numbered sequentially from 1 to 60. If they are re-labeled in reverse order (so that page 1 becomes 60, page 2 becomes 59, etc.), what is the new number of page 18?
  ## Step 1: Identify the transformation
  Each page \( n \) is renumbered in reverse as \( 61 - n \).
  
  ## Step 2: Compute the new number of the original page
  The original page is 18, so the new number is:
  \[
  61 - 18 = 43
  \]
  
  ## Step 3: Provide the final answer
  The final answer is: \( \boxed{43} \)