What approximate value will come in place of the question

If '32 @ 5 = 7' and '46 @ 12 = 12', then '34 @ 18 = ?'. What will come in place of question mark?

Select the number combination of letters that when placed sequentially in the blanks of the given series will complete the series.

E × I : 25 × 81 ∷ K × P : ?

Bull : Cow :: Tutor : ?

6 : 120 : : 24 :  ?

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

BSTN: AQUP :: DNUC : ?

Select the set of numbers that is similar to the following set of numbers.

{22, 30, 38}

CONCEPT : AMLACNR :: COUNTRY :  ?