Verbal Reasoning - Mental Ability Questions

A man said to a lady, "Your mother's husband's sister is my aunt!! How is the lady related to the man ? 

In the folowing questions pickout the most sutiable substitute for the question mark?

6 : 222 :: 25 : ?

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

Gloomy : Dull : : Merciless : ?

If 5#5 = -25, -4#-3 = -12 and 3#-3 = 9, then find the value of 4#5 = ?

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

MN : NM : : JK : ?

In the following question, select the related letter/letters from the given alternatives.

FOT : GOW : : RID  :  ?

In the following question, select the related word pair from the given alternatives.

Vehicle : Bus : : ? : ?

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

JY : 35 : : RT : ?