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    Question

    If a group of 15 boys and 10 girls can finish a task in 36

    days, and a team of 5 girls alone can complete the same task in 72 days, how long will it take for 45 boys to finish the entire task on their own?
    A 4.5 Correct Answer Incorrect Answer
    B 2.4 Correct Answer Incorrect Answer
    C 7.2 Correct Answer Incorrect Answer
    D 12.5 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    ATQ;
    Task done by 5 girls in 1 day = 1/72

    Task done by 10 girls in 1 day = 2/72 = 1/36

    Task done by 15 boys = 1/36 – 1/36 = 0

    Task done by 45 boys = 5/36 = 1/7.2

    Hence, required time = 7.2 days

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