8. In a competition, gold medals are awarded to the top 100 participants based on their scores, and silver medals to the next 80 participants. Later, the last 20 gold medalists are reassigned to the silver medal category, which results in the average score of the gold medalists increasing by 2 points, and the average score of the silver medalists increasing by 3 points. Then, the original average score of the gold medalists was $\qquad$ points higher than that of the silver medalists.
$23$