ATQ, Let total amount of work to done be 72 units (LCM of 12, 24 and 36) Amount of work done by Abhay in one day = 72/12 = 6 units Amount of work done by Beer in one day = 72/24 = 3 units Amount of work done by Tittu in one day = 72/36 = 2 units Let the work is completed in 'w' days According to question, (6 × 4) + (3 × w) + (2 × (w – 6)) = 72 3w + 2w – 12 = 48 5w = 60 w = 12 days
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