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      Question

      A two-digit number is 5 times the sum of its digits. If

      9 is added to the number, the digits get reversed. Find the number.
      A 15 Correct Answer Incorrect Answer
      B 20 Correct Answer Incorrect Answer
      C 45 Correct Answer Incorrect Answer
      D 25 Correct Answer Incorrect Answer

      Solution

      Let number = 10a + b Condition 1: 10a + b = 5(a + b) β‡’ 10a + b = 5a + 5b β‡’ 5a = 4b So a:b = 4:5 β‡’ a=4, b=5 (only valid digit pair) Number = 45 Check: 45 + 9 = 54 (reversed) βœ“ Answer: 45

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