mary had 97 dollars to spend on 9 books. after buying them she had 16 dollars. how much did each book cost?

Mary initially had $97 and after purchasing 9 books, she was left with $16. To find out how much each book cost, follow these steps:

1. Subtract the amount of money Mary had after buying the books from the amount she initially had:
   \[
   97 - 16 = 81
   \]
   So, Mary spent $81 on the 9 books.

2. Now, to find the cost per book, divide the total amount spent by the number of books:
   \[
   \frac{81}{9} = 9
   \]
   Therefore, each book cost $9.

Would you like more details on any step or have any other questions?

### Related Questions:
1. If Mary bought 12 books instead of 9, how much would she have spent?
2. If each book cost $7 instead, how much money would Mary have left after buying 9 books?
3. How much money would Mary need to buy 15 books if each costs $9?
4. If Mary had $120 initially, how much would she have left after buying 9 books at $9 each?
5. What if Mary found a discount and bought each book for $8.50? How much would she have spent?

### Tip: 
When solving word problems, always break them into smaller steps (like subtracting or dividing) to avoid confusion.

Mary had 97 dollars to spend on 9 books. After buying them she had 16 dollars. How much did each book cost?

Learn how to calculate the cost of each book when Mary has 97 dollars, buys 9 books, and is left with 16 dollars. Follow a step-by-step arithmetic approach, including subtraction and division, suitable for students in Grades 4-6.

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