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A 16d (16 penny) nail is larger. The larger the "penny" the larger the nail. But the lengths can vary, but generally an 8d is 2.5" and an 16d is 3 - 3.5".
8d-3d =65 plus work
d2 + 8d + 7 = (d + 7) (d + 1)
100b = 8d
3d + 8d - d - 5 = 10d - 5 = 5*(2d - 1)