A certain two-digit number is 2 times the sum of its digits. If 63 is added to the number, the digits get interchanged. Then the number is
A
16
B
17
C
18
D
None of these
Correct Option:
C
Explanation
Let the two-digit number be 10a + b. Given that it equals twice the sum of its digits: 10a + b = 2a + 2b, so b = 8a. Since b is a digit, a = 1 and b = 8, giving 18. Also, 18 + 63 = 81, exactly reversing the digits.
