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

687 : 612 :: 713 : ? :: 621 : 546

638

687 : 612 :: 713 : ? :: 621 : 546

The logic followed here is :

Ist number - 75 = IInd number

AS

687 : 612

687 - 75 = 612

And

621 : 546

621 - 75 = 546

Similarly

713 : ?

713 - 75 = 638