Civil Service Exam Reviewer · Word Problems · hard
The sum of the digits of a two-digit number is 11. If the digits are reversed, the new number is 27 less than the original. What is the original number?
- 47
- 83
- 74
- 56
Answer
C. 74
Solution
Reversing changes the number by 9 × (difference of digits): 27 ÷ 9 = 3. With digit sum 11, the tens digit is 7 and units 4: 74.
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