Olympiad Test: Coding – Decoding - 1 - Class 6 MCQ

Each letter of the word ‘TRUTH’ is replaced by a set of two letters – one preceding it and the other following it – in the code. Thus, T is replaced by SU, R is replaced by QS and so on. 

All the letters of the word, except the last letter, are written in a reverse order to obtain the code. 

Here,

Divide the word into three groups of two letters each and write the letters of each group in the reverse order.
 

We have,

All the letters of the word, except the last letter, are written in the reverse order and in the group of letters so obtained each letter is moved into steps forward to get the code.
AVOID → IOVAD → KQXCF. 

Clearly, the sixth letter from the left in the code is L. 

Each letter of the word is five steps ahead the corresponding letter of the code. 

The code has been obtained by writing the first four and the last four letters of the word in the reverse order. Thus, we have.
SERPEVRE → SERP/EVRE → PRES/ERVE → PRESERVE.