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    Question

    Komal and Seema individually can complete a task in

    ‘3a’ hours and ‘7a’ hours respectively. If they together can complete (2/3)rd of the work in 7 hours, then find the value of ‘a’.
    A 2 Correct Answer Incorrect Answer
    B 3 Correct Answer Incorrect Answer
    C 4 Correct Answer Incorrect Answer
    D 5 Correct Answer Incorrect Answer

    Solution

    According to the question, => 7 x [(1/3a) + (1/7a)] = 2/3 => 7 x (10/21a) = 2/3 => a = 5

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