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    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?
    A 78 days Correct Answer Incorrect Answer
    B 48 days Correct Answer Incorrect Answer
    C 54 days Correct Answer Incorrect Answer
    D 19 days Correct Answer Incorrect Answer

    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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