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Un article trouvé pour ce sujet.
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Working together |
2001-04-26 |
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Stephanie pose la question :
Tom takes 10 hours to piant a mural on the wall of Evergreen School. Carol takes 6 hours to do the same job. If they work together, how long will it take them to paint the mural?
Claude Tardif and Penny Nom lui répond. |
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