Cup is to coffee as bowl is

In the following question, select the related number from the given alternatives.
243: 819 :: 163 :?

Adam who is 20 years old is 4 times as old as Mary. What will be Mary’s age when Adam is twice as old as her?

In alphabet series, some alphabets are missing which are given in that order as one of the alternatives below it. Choose the correct alternative.
m _ nm _ n _ an _ a _ ma_

What should be the missing term in the following number series?
61, 67, 71, 73, 79, 83, __, 97,

Pointing to the woman in the picture, Rajiv said, “Her mother has only one grandchild whose mother is my wife.” How is the woman in the picture related to Rajiv?

Read the following information carefully and answer the questions given below it:

In a car exhibition, seven cars of seven different companies viz. Cardilac, Ambassador, Fiat, Maruti, Mercedes, Bedford and Fargo were displayed in a row, facing east such that:

(1) Cardilac car was to the immediate right of Fargo.

(2) Fargo was fourth to the right of Fiat.

(3) Maruti car was between Ambassador and Bedford.

(4) Fiat, which was third to the left of Ambassador car, was at one of the ends.

Which of the following is definitely true?

Coal : Heat : : Wax : ?