The sum of a two-digit number and the number formed by reversing its digits is 99, and its digits differ by 5. If the tens digit is smaller than the units digit, what is the number?
Correct answer B. 27
Explanation
11(a + b) = 99 gives a + b = 9. With b - a = 5, a = 2 and b = 7, so the number is 27.
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