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11 February, 13:57

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. 11 February, 14:03
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    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.
  2. 11 February, 14:24
    0
    9 hours

    the average between them is 9

    12+6=18

    18/2=9
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