选择题
2014 AMC 8 Problem 19: Minimizing White Surface Area
A cube with 3-inch edges is to be constructed from 27 smaller cubes with 1-inch edges. Twenty-one of the cubes are colored red and 6 are colored white. If the 3-inch cube is constructed to have the smallest possible white surface area showing, what fraction of the surface area is white?
2014 AMC 8 第19题 ：最小化白色表面积
具有3英寸边缘的立方体将由27个具有1英寸边缘的小立方体构建。其中21个立方体为红色， 6个为白色。如果3英寸的立方体被构造成具有尽可能小的白色表面积，那么表面积的哪一部分是白色的？
A.
5/54
B.
1/9
C.
5/27
D.
2/9
E.
1/3