8. (7 points) The football used in the competition is made of black and white leather pieces sewn together, where the black pieces are regular pentagons and the white pieces are regular hexagons, and the side lengths of the black and white pieces are equal. The sewing method is: each black pentagon's 5 sides are sewn to the sides of 5 white hexagons; each white hexagon's 6 sides, 3 of them are sewn to the sides of black pentagons, and the other 3 sides are sewn to the sides of other white hexagons. If a football has a total of 12 black pentagon pieces on its surface, then, this football should have $\qquad$ hexagon pieces.
【Solution】Solution: Let this football have $x$ hexagons, with a total of $6x$ edges, where three edges of each white piece are connected to black pieces. According to the problem, we can derive the equation
$$
\begin{aligned}
3 x & =12 \times 5 \\
x & =20
\end{aligned}
$$

Answer: This football should have 20 hexagonal pieces.
Therefore, the answer is: 20.