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    Question

    If a group of 14 boys and 21 girls can complete a task in

    28 days, and a team of 7 girls alone can finish the same task in 84 days, how long will it take for 56 boys to complete the entire task on their own?
    A 40 Correct Answer Incorrect Answer
    B 24 Correct Answer Incorrect Answer
    C 30 Correct Answer Incorrect Answer
    D 15 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    ATQ;
    Task done by 7 girls in 1 day = 1/84

    Task done by 21 girls in 1 day = 3/84 = 1/28

    Task done by 14 boys = 1/28 – 1/28 = 0

    Task done by 56 boys = 4/28 = 1/7

    Hence, required time = 7 days

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