105 A cube of wood with an edge length of 3 meters, has a square hole with a side length of 1 meter drilled through the center of each face, all the way through, with the edges of the hole parallel to the corresponding edges of the cube. The total surface area (including the inside) of this object is $\qquad$ square meters.
105 72. It is known that the area of the six faces of the wooden block becomes
$$
6 \times 3^{2}-6=48\left(\text { m }^{2}\right),
$$

and the area of the holes is
$$
\left.4 \times 1^{2} \times 6=24 \text { m }^{2}\right),
$$

thus the total surface area is
$$
48+24=72\left(\text { m }^{2}\right) .
$$