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ATQ, Total amount of work = (30 x 160) = 4800 units Amount of work completed by 12 men = (4800/2) = 2400 units Time taken by 12 men to complete half of the work = (2400/12) = 200 days Amount of work completed by 30 men (12 + 18) = 4800 - 2400 = 2400 units Time taken by 30 men to complete 2400 units = (2400/30) = 80 days Total time taken = 200 + 80 = 280 days
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