The sum of a two−digit number and the number obtained by interchanging the digits is 77. If the difference of digits is 1, then the number is:
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 34.
From the given options,
Number by interchanging digits of 34 = 43
34 + 43 = 77
Hence, the required two-digit number is 77.