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Diana080506

Ответ: Оля 12, Лена 24, Наташа 72

Пошаговое объяснение:

Пусть каштанов будет х, тогда у Оли будет Х каштанов, у Лены 2Х, у Наташи 2Х*3=6Х

Уравнение: Х+2Х+6Х=108

9Х=108

Х=12

У Оли 12 каштанов, у Лены 24, у Наташи 72

Проверка 24+12+72=108

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