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A two-digit number is 4 times the sum of its digits. If 18 is added to the number, its digits get reversed. The number is:

Competition practiceAlgebra
  • A36
  • B12
  • C24
  • D48

Step-by-Step Solution

Let the number be . From we get , so . From we get , so . Then gives and . The number is 24: indeed and 24 + 18 = 42.
Answer: C) 24

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