选择题
2004 AMC 8 Problem 15: Hexagonal Tile Border
Thirteen dark and six bright hexagonal tiles were used to create the figure shown. If a new figure is created by attaching a border of bright tiles with the same size and shape as the others, what will be the difference between the total number of bright tiles and the total number of dark tiles in the new figure?
A.
5
B.
7
C.
11
D.
12
E.
18