Select the combination of letters that when sequentially

Bull : Cow :: Tutor : ?

'Eiffel Tower' is related to 'France', in the same way as 'Great Wall' is related to '____'.

Complete the analogy.

81 : 45 :: 72 : ?

Select the set in which the numbers are related in the same way as are the numbers of the following sets.

In each of the following questions, select the related word from the given alternatives:

COVER : EMXCT :: MOUSE : ?

6 : 120 : : 24 :  ?

If 95 × 24 = 8, 48 × 24 = 6, 37 × 22 = 6, then 67 × 33 = ?

If 34 # 56 = 42 and 89 # 76 = 144, then 67 # 89 = ?

If ECD = 24 and HGF = 42, then JKFG =