Two painters paint a wall in 8 hours; one is lazy and one is energetic; the energetic one would take 12 hours paint the wall on his own; how long would the lazy painter take on his own?
Deux peintres peignent un mur en 8 heures; il y a un paresseux et un énergique; l'énergique pourrait peindre le mur en 12h seul; combien de temps faudrait-il pour le paresseux seul?
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