Question 757468
The sum of two digits of a two-digit number is 13. 
6 possible choices: 49,58,67,76,85,94

If the digits are interchanged, and the resulting number
is added to the original number, then we get 143.

{{{49+94=143}}} {{{94+49=143}}}
{{{58+85=143}}} {{{85+58=143}}}
{{{67+76=143}}} {{{76+67=143}}}

All six possible choices meet the criteria for this problem. More information is needed to determine exact one.