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

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?

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?

Statements: 

I. All circles are triangles. 

II. Some triangles are rectangles 

III. All rectangles are squares. 

Conclusion:

 I. All rectangles being triangles is a possibility 

II. All circles being square is a possibility 

Direction: Two Statements are given following by four conclusions, I, II, III and IV. You have to consider that Statements to be true, even if they seem to beat variance from commonly known facts. You are to decide which of the given conclusions can definitely be drawn from the given Statements. Indicate your answer.
Statements:
All books are boxes.
All boxes are pens.
All pens are papers.
Conclusion: 
I. Some paper are books.
II. All books are papers.
III. Some pens are books.
IV. All boxes are books. 

In the following question select the figure from a set of answer figure that can be formed joining the figures given in question figure.

Coal : Heat : : Wax : ?