Verbal Reasoning - Mental Ability Questions

If @ means +, # means -, $ means x and * means /, then what is the value of 16 @ 4 $ 5 # 72 * 8 = 

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

97 : 63 : : 67 : ?

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

79 : 63 : : 54 : ?

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

DA : FE : : HI : ?

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

8 : 27: : 9 : ?

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

9 : 27 : : 64 : ?

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

Money : Poverty : : Education: ?

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

Scientist : Laboratory : : Astronomer : ?