Select the option that is related to the fifth number in the same way as the second number is related to the first number and fourth number is related to third number.

6 : 12 :: 15 : 75 :: 18 : ?

108

6 : 12 :: 15 : 75 :: 18 : ?

The  logic followed here is :

IST NUMBER × (IST NUMBER ÷ 3) = IIND NUMBER

AS

IST NUMBER × (IST NUMBER ÷ 3) = IIND NUMBER

= 6 × (6 ÷ 3)

= 6 × 2

= 12

AND

15 × (15 ÷ 3) = IIND NUMBER

= 15 × (15 ÷ 3)

= 15 × 5

= 75

SIMILARLY

18 × (18 ÷ 3) = IIND NUMBER

= 18 × (18 ÷ 3)

= 18 × 6

= 108