Correct Answer - Option 1 : 18
Calculation :
Let the two digit number be 10x + y
Wen digits reversed, the number will be = 10y + x
Accordinly,
10x + y + 63 = 10y + x
⇒ 10x - x + y - 10y = -63
⇒ 9x - 9y = -63
⇒ x - y = -7
⇒ y - x = 7
Go through the options there is only one option whose digit difference is 7, which is 18.
∴ The required answer is 18.