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ATQ,
Let the total work = 75 units (LCM of 25 and 75)
Combined efficiency of 'Ankit' and 'Manish' = (75/75) = 1 unit/day
Combined efficiency of 'Ankit', 'Manish', and 'Tarun' = (75/25) = 3 units/day
Efficiency of 'Tarun' = 3 - 1 = 2 units/day
Time taken by 'Tarun' to complete the work alone = (75/2) = 37.5 days
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