数学任务，将10星评级转换为向上和向下

Question

我想将我的文章评级脚本从10星评级（gdsr）改为up和downvotes（如youtube）。

但我不想放弃目前的评级，所以我的想法是将当前（10星gdStarRating）转换为上下投票。

我的问题是数学公式...我不明白。

例如

10 members has voted, the rating is 9
= 9 upvotes and 1 downvote

另一个例子

18 member has voted, the rating is 9.6
=  ?? upvotes and ?? downvotes

或

15 member has voted, the rating is 8.8
=  ?? upvotes and ?? downvotes

什么是正确的（PHP）数学公式？

Answer 1

将评分比率乘以总票数，以获得与您当前投票/ 10比率最接近的上/下比率

即。

18 member has voted, the rating is 9.6
=  ?? upvotes and ?? downvotes

等级9.6转换为96％的赞成票，18 * 96％= 17.23 =＆gt; 17票1票下来投票

15 member has voted, the rating is 8.8
=  ?? upvotes and ?? downvotes

8.8的评级转换为88％的赞成票，15 * 88％= 13.2 =＆gt; 13票2票下来

PHP示例

$totalvotes = 18;
$rating = 9.6;
$upvotes = round($totalvotes * ($rating/10));
$downvotes = $totalvotes - $upvotes;