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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 ย By adding the first two equations, we get

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