Chic-fil-A Problem¶
You decide to invest in a series of billboards along interstate 10 to advertise your stylish new chicken restaurant,
Chic-fil-A 
.
- You buy three billboards evenly spaced starting from mile marker 17 and ending on mile marker 28.
- You buy another three billboards starting on mile marker 32 and ending on mile marker 36.
- In order, from mile marker 17 to 36, your billboards display these ads: A, B, C, C, B, A.
Determine how far each B ad is from your restaurant which is located at mile marker 30.
# ads / restaurant*: A B C * C B A
# billboards: --|-----|-----|---|---|--|--|--
# mile markers: 17 28 30 32 36
import numpy as np