Correct Answer: 20 : 105

Solution : Here, in the first pair–

9 : 50 ⇒ 9 x 5 + 5 = 50

Applying this same logic, in all the given alternatives we will get –

Option first:

⇒ 22 x 5 + 5 =115

But here , 22 : 110 is given which is not correct.

Option second:

⇒ 18 x 5 + 5 = 95

But here , 18 : 190 is given which is not correct.

Option third:

⇒ 15 x 5 + 5 = 80

But here , 15 : 225 is given which is not correct.

Option fourth:

⇒ 20 x 5 + 5 =105

Here, 20 : 105 is given which is correct .

Hence, option fourth is correct.