If PKROK code with 72962 and KRRPK coded with 29972 then how will be coded NJMLZ?

Given set
10.5, 15.0, 21.5 

What will come in place of question (?) mark in the following series?
CD     FG     JK     ?        UV

Select the set in which the numbers are related in the same way as are the numbers of the following sets. (NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into its constituent digits. E. g. 13 – Operations on 13 such as adding / subtracting / multiplying etc. to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed)

(11, 33, 17)
(18, 44, 21)

If HONESTY is written as ABCXZDQ, how can TONY be written in that code? 

A, B, C, D, E, F, G and H are sitting around a circular table facing the centre but not necessarily in the same order. C is an immediate neighbour of both G and A. E sits second to left of C. Two people sit between E and H. B is an immediate neighbour of G. Only one person sits between B and F. Who amongst the following is an immediate neighbour of both B and F?