Coding and Decoding Questions

The alphabets are coded as follows :

$$\begin{gathered} C H A R O L M E \\ 4 5 1 6 9 3 2 7 \end{gathered}$$

R is coded as 6,

E as 7,
A as 1  and
L as 3.
So, the code for REAL is 6713

The letters of the word are reversed in order, taking two at a time, to obtain the code.

From the given information :

how can you go = ja da ka pa....(1)
can you come here = na ka sa ja...(2)
come and go = ra pa sa....(3)
from (1)&(2), can you = ja ka...(4)
from (2)&(3), come = sa...(5)
Using (4)&(5) in (2), we get here = na.

In the first and third statements, the common code word is 'peru' and the common word is 'fine'.

So, 'peru' means 'fine'.

Word is divided into groups of two letters each and then letters of each group move one place forward and one place backward alternatively as in English alphabet. Hence, 

PERINATH => PE RI NA TH =>QFQHOBSG  and POLE => PO LE => QPKD

similarly,

SYNDROME => SY ND RO ME => TZMCSPLD

Letters of the word PREMONITION are coded as follows:

Letters :  P    R    E    M    O    N    I    T    I    O    N

Code:        6    8    5    3    0    4    9    2    9    0    4

See the code below Is and Ns. Codes for I and N are 9 and 4 respectively. This indicates that the digits below each letters represent its code. Therefore, code for the word MONITOR is 3049208