选择题
2025 AMC 8 Problem 15: Grid Fold
Kei draws a 6-by-6 grid. He colors 13 of the unit squares silver and the remaining squares gold. Kei then folds the grid in half vertically, forming pairs of overlapping unit squares. Let m and M equal the least and greatest possible number of gold-on-gold pairs, respectively. What is the value of m + M?
2025 AMC 8 第 15 题：网格折叠
Kei 绘制了一个 6×6 的网格。他将 13 个单位方块涂成银色，其余方块涂成金色。然后 Kei 将网格垂直对折，形成一对重叠的单位正方形。令 m 和 M 分别等于金对金对的最小和最大可能数量。 m M 的值是多少
A.
12
B.
14
C.
16
D.
18
E.
20