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-- Mr. A. can complete the job in 12 days.

-- He does 1/12 of the job in 1 day.

-- Mr. B. is 60% as efficient as Mr. A. is.

-- Mr. B. does (60% of 1/12) = 0.6/12 = 1/20 of the job in 1 day.

-- It takes Mr. B. 20 days to do the same work.

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