Question
‘D’ and ‘E’ together finish a task in 20 days.
If ‘D’ is 70% more efficient than ‘E’, how many days will ‘E’ take to complete the task alone?Solution
Let the efficiency of ‘E’ be 10x units. Efficiency of ‘D’ = 10x × 1.7 = 17x units Total work = 20 × (10x + 17x) = 540x units Time taken by ‘E’ alone = 540x ÷ 10x = 54 days
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