If COOL is coded as DQRP, then write the code for HOT

Sushant said "This girl is the wife of the grandson of my mother. How is Sushant to the girl? 

Direction : Study the following information carefully and answer the given questions.
 A, B, C, D, E, F, G and H are sitting around a circular area at equal distance between each other, but not necessarily in the same order. Some people face the centre while some face outward (i.e. in a direction opposite the centre.) B sits third to the right of E. E faces outward. Only one person sits between B and F. Both the immediate neighbours of F face outward. Only three persons sit between G and H. G is not an immediate neighbour of B. Both the immediate neighbours of D face the centre. D is not an immediate neighbour of G. Both the immediate neighbours of C face the centre. Both the immediate neighbours of E face a direction opposite that of G (i.e. if G faces the centre, then both the immediate neighbours of E face outward and vice versa).

Who among the following are immediate neighbours of F? 

Select the set of numbers that is similar to the following set of number.
(17, 25, 37)

In a code language, CRICKET in written as NSENTIK. How will TENNIS be written as in that language?

If in certain code EDITION is written as 3891965, then how TIDE will be written in that code? 

Complete the following series.
ZIP, WIP, TIP, ?.