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Ana = (Juan) / 2 (1)
Juan = (Pedro) / 3 (2)
Ana + Juan + Pedro = 1800 (3)
(Juan/2) + (Pedro)/3 + Pedro = 1800 (Sustituy (1) y (2) en (3))
(Pedro/3)/2 + Pedro / 3 + Pedro = 1800
Pedro/6 + Pedro/3 + Pedro = 1800
Pedro + 2*Pedro + 6*Pedro = 6*1800 (aplic MCM)
9*Pedro = 10 800 (Suma de términos semejantes)
Pedro = 10 800/9 (Despeje)
Pedro = 1200 $
Juan = (1200) / 3
Juan = 400 $
María = (400) / 2
María = 200$
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