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Х + 3Х = 40
4Х = 40
Х = 40/4
Х = 10 ( Лет ) - Сыну.
10 * 3 = 30 ( Лет ) - Папе.
ответ: Сыну - 10 лет, Папе - 30 лет.
Проверка: 10 + 30 = 40.