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.**