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APSC CCE 2023 · Question 145 of 163

The sum of both the digits of a two-digit number is 7. If the digits of the number are interchanged, the number so formed is greater than the original number by 27. The original number is

Quantitative Aptitude

  1. A25Correct
  2. B43
  3. C52
  4. D34

Answer: A. 25

Explanation

a+b=7 and b−a=3 give a=2, b=5, so the number is 25.

Source: APSC CCE Prelims 2023 GS Paper-II, official Series-A key

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