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Ответ дан
tanian11
х - всего учеников
3/5х - занимаются в кружках
2/3 * 3/5 * х  - занимаются спортом
 frac{2}{3} *  frac{3}{5} * х = 12
 frac{2}{5} * х = 12
х = 12 *  frac{5}{2}
х = 30
В классе 30 учеников
 

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