A seventh grade and eighth grade student problem

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In a tournament involving seventh and eighth graders, each contestant played against every other contestant once. There were significantly more eighth graders, with a ratio of ten to one compared to seventh graders. Despite this, eighth graders only managed to win four-and-a-half times the points of the seventh graders. The problem concludes that there were 2 seventh graders who achieved 4 wins, while 20 eighth graders won a total of 18 matches. This illustrates a competitive dynamic where fewer seventh graders performed effectively against a larger group.
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Seventh- and eighth-grade students participated in a tournament. Each contestant played each other contestant once. There were ten times as many eighth-grade students, but they were able to win only four-and-a-half times as many points as seventh graders.

How many seventh-grade students participated, and how many points did they collect?

Note: Assume one point for every win, and no drawn outcomes.
 
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Spoiler:There were 2 seventh graders who had 4 wins and 20 eighth graders who had 18 wins.
 

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