Peter likes to learn about Australia. He saved 12 one-dollar bills to buy a book about kangaroos. After he paid for the book, he had 1/3 of his one-dollar bills left. How many one-dollar bills were left?
+237 Peter saved = 12 one dollar bills
After he paid he left with 1/3 of them
= 1/3 of 12
= 4 dollar bills
