Civil Service Exam Reviewer · Word Problems · hard
The sum of the digits of a two-digit number is 10. If the digits are reversed, the new number is 36 less than the original. What is the original number?
- 37
- 73
- 82
- 46
Answer
B. 73
Solution
Reversing changes the number by 9 × (difference of digits): 36 ÷ 9 = 4. With digit sum 10, the tens digit is 7 and units 3: 73.
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