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Ratio of efficiency of Amit and Vivek = 5:3 Ratio of time taken by Vivek and Sameer alone to complete the work = 5:4 Ratio of efficiency of Vivek and Sameer = 4:5 ⇒ Ratio of efficiency of Amit, Vivek and Sameer = 20: 12: 15 Total unit of work = (15/70) × 100 × 35(20 + 15) = 750 units Required time = (750/27) × (90/100) = 25 days
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