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Let the total amount of work = 240 units (LCM of 40 and 60) Work done by ‘D’ and ‘E’ together in one day = 240 / 40 = 6 units Work done by ‘E’ and ‘F’ together in one day = 240 / 60 = 4 units Work done by ‘D’ and ‘E’ together in 30 days = 30 × 6 = 180 units Remaining work = 240 - 180 = 60 units Efficiency of ‘F’ = 60 / 20 = 3 units per day Efficiency of ‘E’ = 4 - 3 = 1 unit per day Efficiency of ‘D’ = 6 – 1 = 5 units per day Share of ‘D’ = (5 / (5 + 1 + 3)) × 1800 = 5/9 × 1800 = Rs 1000
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