Question 843267
set d = the left hand digit
 e = right hand digit
d + e = 13
Possible sets of two positive numbers whose sum is 13
1 12
2 11
3 10
4 9
5 8
6 7
For our problem each number needs to be 1 digit so
we are left with
4 9
5 8
6 7
Consider 94 and 49. There difference is more than 13.
58 and 85 , difference is more than 13
67 and 76.  These are our numbers.
Notice that 76-67 = 13.