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    Question

    X can work as fast as Y and Z together. X and Y together

    can finish the same task 3 times as fast as Z. If all three working together can finish the task in 18 days, how many days, will Z take to finish the task?
    A 80 Correct Answer Incorrect Answer
    B 72 Correct Answer Incorrect Answer
    C 60 Correct Answer Incorrect Answer
    D 90 Correct Answer Incorrect Answer

    Solution

    Let the number of days it takes. X to finish the task be x Y to finish the task be y Z to finish the task be z Therefore, as per the given relations  By adding the first two equations, we get

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