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The sum of the digits of a two-digit number is 9. When 27 is added to the number, its digits are reversed. The number is:

Competition practiceAlgebra
  • A27
  • B45
  • C36
  • D63

Step-by-Step Solution

Let the number be with . Then gives , so . With we get and . The number is 36, and indeed 36 + 27 = 63.
Answer: C) 36

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