Alternate Method: 12 Men can do this job in 9 days and 18 women can do this job in 12 days It means 6 men or 3 women can do this job in = 36 days So 8 Men and 8 women can do this job in = 36/{8/6 + 8/3} = 36/ {8/(6/3) = 9 days
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