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Let the total work be 135 units. {LCM (27 and 45)} So, combined efficiency of 'Andy' and 'Ben' = 135 ÷ 27 = 5 units/day Efficiency of 'Andy' = 135 ÷ 45 = 3 units/day So, efficiency of 'Ben' = 5 - 3 = 2 units/day So, time taken by 'Ben' to do the work alone = 135 ÷ 2 = (135/2) days
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