Choose the best equation that fits the word problem below.

Sarah is planning to buy some books. Each book (b) costs $15. How many books can Sarah purchase if she has saved $60?

The best equation that fits the word problem is:

15b = 60

To find out how many books Sarah can purchase, we can set up an equation using the given information:

Let b represent the number of books Sarah can purchase.
Since each book costs $15, the total cost of the books Sarah can buy is 15b.
Sarah has saved $60, so we can set up the equation:
15b = 60

Therefore, the best equation that fits the word problem is 15b = 60.

To solve this problem, we can use the equation:

b * 15 = 60

where b represents the number of books Sarah can purchase. The equation is formed by stating that the cost of each book, $15, multiplied by the number of books, b, equals the total amount Sarah has saved, $60. By rearranging the equation, we can solve for b:

b = 60 / 15

b = 4

Therefore, Sarah can buy 4 books with her savings of $60.