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    Question

    Ravi and Sunil can complete a task in 12 days and 30

    days respectively. Ravi started the task alone. After how many days should Sunil join him so that the task is completed in 10 days?
    A 2 Correct Answer Incorrect Answer
    B 5 Correct Answer Incorrect Answer
    C 1 Correct Answer Incorrect Answer
    D 8 Correct Answer Incorrect Answer

    Solution

    ATQ,

    Let the total work be 60 units (LCM of 12 and 30)

    Efficiency of Ravi = 60 / 12 = 5 units/day

    Efficiency of Sunil = 60 / 30 = 2 units/day

    Let the time after which Sunil joined be n days.

    So,

    5n + (5 + 2) × (10 - n) = 60

    5n + 70 - 7n = 60

    -2n = -10

    n = 5

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