the schools in an athletic conference compete in a cross country meet to which each school

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Mathematics
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Question description

the schools in an athletic conference compete in a cross country meet to which each school has three participants. Erin, Katelyn and Illiana are the three representatives from one school. Erin finished the race in the middle position. Kaitlyn finished after Erin, in the 19th position, and Iiliana finished 28th. How many schools took part in the race?

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