 The Coding-Decoding is part of verbal reasoning. It is used to test person’s ability to decipher the code language. Coding is the process of converting a word into another word while decoding is converting back the converted word to its original word. It is required to decode the logic behind the coding and then apply it to code or decode another word.

The questions on coding and decoding are basically of three types:

i. LETTER TO LETTER
Example
If ‘SHIMLA’ is written as ‘RGHLKZ’, how will PATNA be written?
a) OZTMZ
b) OZSMZ <-
c) QBUMB
d) OZTZM
Solution: Each letter is coded as the letter previous to it i.e. S = R, H = G, M = L, L = K and so on. Therefore PATNA will become OZSMZ.

ii. LETTER TO NUMBER
Example
If LODES is coded as 46321, how will you code the word DOES?
a) 1234
b) 4321
c) 3621 <-
d) 3261

Solution: Here, all letters of DOES are present in LODES i.e. D = 3, O = 6, E = 2, S = 1.

iii. MISCELLANEOUS TYPES
Example
In a certain code ‘415’ means ‘milk is hot’, ’18’ means ‘hot soup’, and ‘895’ means ‘soup is tasty’. What number will indicate the word ‘tasty’?
a) 9<-
b) 8
c) 5
d) 4
Solution: Here, ‘hot’ is 1, ‘soup’ is 8. Which implies ‘is’ is 5. Therefore ‘tasty’ is 9.

also see

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