Thomas has an album that holds 600 baseball cards each page of the album holds 6 cards. If 45% of the album is empty, how many pages are filled with baseball cards

55 pages

Step-by-step explanation:

Knowing that the book holds 600 cards and 6 cards/page, we can tell that there are 100 pages.

From that, we know that 45% are empty, which means 55% of all of the pages have cards.

55% of 100 is 55. Therefore, 55 pages have baseball cards.