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2/7 th of  a job  in  5 days.

so 7 * 2/7  th of a job in  7 * 5 days.
ie..  two times the job in  35 days.

so  the job is done in  35/2 = 17.5 days.

Already  5 days she spent in doing 2/7 of job.  So she will need  12.5  more days.

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