###Human: Stella collects stamps. She counted 50 pages in her collector's album. There are 5 rows of 30 stamps in each of the first 10 pages of her album. The rest of the pages each have 50 stamps. How many stamps are in Stella's album?, ### Assistant: There are 30 x 5 = 150 stamps on each of the first 10 pages.
So she has a total of 150 x 10 = 1500 stamps in the first 10 pages.
There are 50 - 10 = 40 pages that have 50 stamps each.
There is a total of 40 x 50 = 2000 stamps in the remaining 40 pages.
Therefore, Stella has 2000 + 1500 = 3500 stamps in her album. 
 So the answer is :  3500