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20 November, 06:44

Joseph and Chandra are cleaning their house which has 12 rooms, each about the same size. If Joseph cleans them by himself, it takes him 6 hours. If Chandra cleans them by herself, it takes her 12 hours. If they both clean the house, they will finish in 4 hours. If they work together, how many rooms will Chandra clean and how many will Joseph clean?

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  1. 20 November, 08:34
    0
    9 hours

    the average between them is 9

    12+6=18

    18/2=9
  2. 20 November, 09:56
    0
    It should be 6 and 6, with 12 rooms, however Joseph is speedier than Chandra, I believe that he will clean more than half the rooms, 8 or 9.
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Home » Mathematics » Joseph and Chandra are cleaning their house which has 12 rooms, each about the same size. If Joseph cleans them by himself, it takes him 6 hours. If Chandra cleans them by herself, it takes her 12 hours.
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