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    Question

    A and C together can paint a wall in 18 days. If C takes 36

    days to do it alone, and C works for 27 days after A leaves the job, what is the percentage of work completed by A?
    A 15% Correct Answer Incorrect Answer
    B 10% Correct Answer Incorrect Answer
    C 25% Correct Answer Incorrect Answer
    D 35% Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    ATQ,

    Let total work = 36 units

    Efficiency of (A + C) = 36 / 18 = 2 units/day

    Efficiency of C = 36 / 36 = 1 unit/day

    Work done by C = 27 × 1 = 27 units

    Work done by A = 36 – 27 = 9 units

    Percentage of work done by A = (9 / 36) × 100 = 25%

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