Question 1106490
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The numbers are 3x, 9x and 10x for some x.


And the condition says that

3x, 9x and 10x + 10 

form an AP.  It implies


9x-3x = (10x+10) - 9x,   or


6x = x + 10  ====>  5x = 10  ====>  x = 2.


<U>Answer</U>.  The numbers are 6, 18  and 30.
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