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    Question

    ‘M’ and ‘N’ together can do a piece of work in

    50 days. If ‘M’ is 50% more efficient than ‘N’, how long will ‘N’ take to do the work alone?
    A 178 days Correct Answer Incorrect Answer
    B 148 days Correct Answer Incorrect Answer
    C 125 days Correct Answer Incorrect Answer
    D 198 days Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Let the efficiency of ‘N’ be 10x units. Efficiency of ‘M’ = 10x × 1.5 = 15x units Total work = 50 × (10x + 15x) = 1250x units Time taken by ‘N’ alone = 1250x ÷ 10x = 125 days

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