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MGSM / Adrians Alter ist das Dreifache des Alters von Harriet, und Harriet ist halb so…

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Adrians Alter ist das Dreifache des Alters von Harriet, und Harriet ist halb so alt wie Zack. Berechnen Sie das Durchschnittsalter der drei in drei Jahren, wenn Harriet jetzt 21 Jahre alt ist.

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