Answer:
50 pages are filled with stamps.
Explanation:
If 50% of the album is empty, then 50% of the album is filled with stamps.
So, the total number of stamps that the album holds is 500, and half of that (50%) is filled with stamps, which is:
500 * 50% = 250 stamps
Each page holds 5 stamps, so the number of pages filled with stamps is:
250 stamps / 5 stamps per page = 50 pages
Therefore, 50 pages are filled with stamps