Verbal Reasoning - Mental Ability Questions

If A + B = 2C and C + D = 2A, then

Select the related word/letters/number from the given alternatives.

9 : 27 : : 64 : ?

Select the related number from the given alternatives.

0.04 : 0.2 :: 0.09 : ?

Select the related word/letters/numbers from the given alternatives:

Magazine : Editor :: Drama : ?

In the following question, select the related number from the given alternatives.

63 : 105 : : 48 : ?

Select the related word/letters/number from the given alternatives.

PZQW : NXOU :: FISK : ?

Select the related word/letters/number from the given alternatives.

XY : AB : : LM : ?

Select the related word/letters/number from the given alternatives.

BDFH : YWUS :: JLNP : ?