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

14 : 21 :: 34 : ? :: 47 : 87

61

14 : 21 :: 34 : ? :: 47 : 87

The  logic followed here is :

IST TERM × 2  - 7  = IIND TERM

AS

14 × 2  - 7 

= 28 - 7 

= 21

AND

47 : 87

47 × 2  - 7 

= 94 - 7

= 87

SIMILARLY

34 : ?

34 × 2  - 7 

= 68 - 7

= 61