To find out how many one-dollar bills Alex had left after buying the book about kangaroos, we can follow these steps:
1. Alex saved 12 one-dollar bills to buy the book.
2. After paying for the book, he had 1/4 of his one-dollar bills left.
3. If 1/4 of his one-dollar bills were left, this means he spent 3/4 of his one-dollar bills on the book (since 1 - 1/4 = 3/4).
4. To find out how many one-dollar bills he spent on the book, we can calculate 3/4 of 12: 3/4 * 12 = 9 So, Alex spent 9 one-dollar bills on the book. 5. Since he spent 9 one-dollar bills, the number of one-dollar bills he had left is: 12 (total) - 9 (spent) = 3
Therefore, Alex had 3 one-dollar bills left after buying the book about kangaroos.
Hope this helps! Pls mark me Brainliest! :)
