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    Question

    Priya alone can paint a wall in 30 days. Priya and Neha

    together can do it in 18 days. How many days would Neha take to paint the wall by herself?
    A 36 Correct Answer Incorrect Answer
    B 38 Correct Answer Incorrect Answer
    C 27 Correct Answer Incorrect Answer
    D 45 Correct Answer Incorrect Answer

    Solution

    ATQ,

    Let the total work be 90 units {LCM (30 and 18)}

    Efficiency of Priya = (90/30) = 3 units/day

    Efficiency of Priya and Neha together = (90/18) = 5 units/day

    Efficiency of Neha = 5 - 3 = 2 units/day

    Time required by Neha to complete the work alone = (90/2) = 45 days

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