There were 60 students in the gym. Three-fourths of them were seniors. After a group of seniors left to attend a meeting, only two fifths of the remaining students were seniors. How many students left to attend the meeting?

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There were 60 students in the gym. Three-fourths of them were seniors. After a group of seniors left to attend a meeting, only two fifths of the remaining students were seniors. How many students left to attend the meeting?

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