Correct Answer - Option 4 : 19

**Given**

Reversed number = 3 × original number + 34

b = 9 × a ------(1)

where a and b are the assumed digits of the number.

**Formula used**

**Any two digit number can be expressed in the form 10a + b**

**Calculation**

⇒ Let (10a + b) be the number before reversing

⇒ So the number after reversing becomes (10b + a)

⇒ 10b + a = 3 × (10a + b) + 34 ------(2)

⇒ Substituting (1) in (2) gives

⇒ a = 1 and b = 9

∴ 19 is the number before reversing.