Answer:
There should be 424 pages between these volumes.
Explanation:
The pages of these volumes are doubled or multiplied twice because of the page numbers being back to back in which there should be 270 pages for volume 1 and 170 pages for volume 2. Between these pages, you should add 270 and 154 together to get your final answer in which there are 424 pages between the first page of volume 1 and 154th page of volume 2.