⇒Number of pages read by Aurey in a day =8 pages
He is on page 40.
Number of days required to reach on page 40,if he reads 8 pages in day

⇒Number of pages read by lauren in a day =4 pages
After 5 days , number of pages read by lauren =4 ×5=20 Pages
So,Lauren is on 20th page after 5 days.