Three excursions
Each pupil of the 9 A class attended at least one of the three excursions. There could always be 15 pupils on each excursion. Seven participants of the first excursion also participated in the second, 8 participants of the first excursion, and 5 participants of the second excursion also attended the third. Four pupils participated in all three excursions. How many pupils were in the 9 A class?
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