Question 391895
The problem seem to have a typo somewhere, thus giving a strange answer. 
Please check. But here is how you can solve it.

Let,
U = Digit in units place
T = Digit in tens place

But remember U and T are only DIGITs or the FACE values!
The place values will make the original number to be: 10T + U

After reversing the digits the new number will be: 10U + T
Now we have two relationships:
10U + T = 10T + U + 6     ...(I)
U = 2T        ...............(II)
Substituting U = 2T from equation (II) to equation (I)
10 (2T) + T = 10T + (2T) + 6
20T + T = 12T + 6
21T - 12T = 6
T = 6/9 ......But this cannot be a DIGIT. 
So the given problem is not correct.