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    Question

    Meena can paint a house in 24 days. If Meena and Reena

    together can complete it in 15 days, then how many days will Reena take to finish the work on her own?
    A 20 days Correct Answer Incorrect Answer
    B 60 days Correct Answer Incorrect Answer
    C 30 days Correct Answer Incorrect Answer
    D 40 days Correct Answer Incorrect Answer

    Solution

    ATQ,

    Let the total work be 120 units {LCM (24 and 15)}

    Efficiency of Meena = (120 / 24) = 5 units/day

    Efficiency of Meena and Reena together = (120 / 15) = 8 units/day

    Efficiency of Reena = 8 - 5 = 3 units/day

    Time required by Reena to complete the work alone = (120 / 3) = 40 days

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