Coding-Decoding

CODING-DECODING is an important part of Logical reasoning section in all aptitude related examinations.
Coding is a process used to encrypt a word, a number in a particular code or pattern based on some set of rules.
Decoding is a process to decrypt the pattern into its original form from the given codes.

Letter Coding In this type of questions, alphabets of a word are replaced by some other alphabets according to specific rule to form code.

Number Coding In this type of questions, a word is replaced by certain numbers according to some specific rule.

Sample Problems –

Question 1: If EARTH is written as FCUXM in a certain code. How is MOON written in that code?
Solution :

Question 2: If DELHI is written as EDMGJ in a certain code. How is NEPAL written in that code?
Solution :

Question 3: If SYMBOL is written as NZTMPC is a certain code. How is NUMBER written in that code?
Solution : Acc. to question

Question 4: In a certain code, COMPUTER is written as PMOCRETU, how is DECIPHER written in that code?
Solution : Acc. to question

Question 5: In a certain code, NEWYORK is written as 111, how is NEWJERSEY written in that code?
Solution : In NEWYORK
N = 14, E = 5, W = 23, Y = 25, O = 15, R = 18, K = 11
Total = 14 + 5 + 23 + 25 + 15 + 18 + 11 = 111
In NEWJERSEY
Total = 14 + 5 + 23 + 10 + 5 + 18 + 19 + 5 + 25
= 124

Question 6: In a certain code, HARYANA is written as 8197151, how is DELHI written in that code?
Solution : We used the number of alphabets here.
H = 8
A = 1
R = 18 = 1+8 = 9
Y = 25 = 2+5 = 7
For DELHI
D = 4
E = 5
L = 12 = 1+2 = 3
H = 8
I = 9
Hence, DELHI is written as 45389.

Question 7: In a certain code BOMB is written as 5745 and BAY is written as 529, how is BOMBAY written in that code?
Solution : Acc. to question
Use the numbers to relate the words

      B O M B      B A Y      ->          B O M B A Y 
      5 7 4 5      5 2 9                  5 7 4 5 2 9


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