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    Question

    P’s 5 days work is equal to Q’s 7 days work. If P

    and Q together can complete the work in 20 days then how much time Q will take to complete 75% of the work?
    A 60 days Correct Answer Incorrect Answer
    B 48 days Correct Answer Incorrect Answer
    C 36 days Correct Answer Incorrect Answer
    D 54 days Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Ratio of efficiency of P and Q = 7:5 Let the efficiency of P and Q be 7x and 5x units per day respectively. Total work = 12x × 20 = 240x units Required time = (0.75 × 240x)/5x = 36 days

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