The difference between the digits of a 2-digit number is 4. If the places of the digits are interchanged, the sum of the original number and the new number is 110. Find the number?
Answer: 37
Explanation
For 37:Original number: 37
New number: 73
37 + 73 = 110 (valid)
Difference between digits: 7 - 3 = 4 (valid)
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