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OpenStudy (anonymous):
Algebra Word Problem ( Work): A woman can do a certain job in 10 hours and her youngest daugther can do the job in 12 hours. After the woman and her youngest daugther work together for one hour, they are joined by the oldest daugther and the three of them finish the job in 3 more hours. How long does it take the oldest daugther to complete the job by herself?
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