24. In the intelligence competition held in the Sheep Village on Green Green Grassland, it was found that the average score of the top five is 1 point less than the average score of the top three, and the average score of the top seven is 3 points less than the average score of the top five. If the average score of the 4th to 7th place is 84 points, then the average score of the top three is $\qquad$ points.
$91$