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work and wages

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A and B took a job to be completed in 20 days. They started working together and after 12 days, C joined them and the whole job finished in 15 days. How much time would C require to complete the job if only C was hired?
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Here A, B and C are the no. of days taken by them to complete the given job respectively.

Hence, the time taken by C to complete the job is 12.

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