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.