The average of the first and the second of three numbers is 15 more than the average of the second and the third of these numbers . what is the difference between the first and the third of these three numbers?
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The average of the three numbers x , y and z is 45 , x is greater than the average of y and z by 9. The average of y and z is greater than y by 2 .Then the difference of x and z is:

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