The Mystery of Carol and Her Father's Ages

[bindwood]

carol's age in years, can be expressed by reversing the digits in her father's age, in years. the sum of the digits in each age is 10.
the positive difference between carol's age in years, and her fater's age in years___36
a.>
b.<
c.=
d.uncertain

In my opinion, there are four pairs: (19,91),(28,82),(37,73),(46,64). the differences are 72,54,36,18 respectively. so I choose d. But the answer is b, I was confused. Am I wrong or the answer is incorrect? Can you throw some ideas? Any help would be much appreciated.

 

[neutrino]

Please don't "double post" homework questions. The same question has been answered in your earlier thread, albeit four minutes later than the current one.