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    Question

    Sam alone can complete a work in 60 days. Arun is three

    times as efficient as Sam. Find the percentage of work completed by Sam and Arun together in 15 days.
    A 43% Correct Answer Incorrect Answer
    B 60% Correct Answer Incorrect Answer
    C 80% Correct Answer Incorrect Answer
    D 100% Correct Answer Incorrect Answer

    Solution

    ATQ,

    Let the efficiency of Sam = x units/day

    Total work = 60x units

    Efficiency of Arun = x × 3 = 3x units/day

    Work done by Sam and Arun together in 15 days = (x + 3x) × 15 = 60x units

    Percentage of work done = (60x / 60x) × 100 = 100%

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