Each book costs $15. since he had 18 dollars left, you can subtract 18 from 108. then divide that answer by 6. 90/6 = 15.
Hope that helped!
Answer:
its 124 because I did the the math
Answer:
114
Step-by-step explanation:
Step-by-step explanation:
6:8=9:12=12:16=15:20
