Joan had $147 to spend on eight books. After buying them she had $11. How much did each book cost?

Each book costs $17

Step-by-step explanation:

Step 1: Make an expression

147 total - > 147 =

8 books - > 8x

11 left - > 11

Expression: 147 = 8x + 11

Step 2: Subtract both sides by 11

147 - 11 = 8x + 11 - 11

136 = 8x

Step 3: Divide both sides by 8

136 / 8 = 8x / 8

17 = x

Answer: Each book costs $17