Discussion
The difference between a two-digit number and the number formed by reversing its digits is 45. The difference between its digits is:
Answer: A
\[ (10a + b) - (10b + a) = 9(a - b) = 45 \]
\[ a - b = 5 \]
The difference of a two-digit number and its reversal is always nine times the difference of the digits.
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