Coding Decoding - Logical Reasoning Question and Answer
Last Updated :
17 Jun, 2025
Coding-decoding is an important part of the Logical Reasoning section in most of the competitive examinations in India.
Coding and decoding questions are a common feature in the reasoning ability section of major Government exams, such as those conducted by banks, insurance companies, SSC, and RRB.
Prerequisites: Coding-Decoding - Tricks
Practice Quiz
Coding Decoding Quiz
Solved Questions on Coding-Decoding
Q1. If EARTH is written as FCUXM in a certain code. How is MOON written in that code?
Solution :
Q2. If DELHI is written as EDMGJ in a certain code. How is NEPAL written in that code?
Solution :
Q3. If SYMBOL is written as NZTMPC is it a certain code? How is NUMBER written in that code?
Solution:
Acc. to question
Q4. In a certain code, COMPUTER is written as PMOCRETU, how is DECIPHER written in that code?
Solution:
Acc. to question
Q5. 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
Q6. 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.
Q7. 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
Q8. COMPUTER" is coded as 3 15 13 16 21 20 5 18, and "DEVICE" is coded as 4 5 22 9 3 5. Then, what would be the code for "RECIPE"?
Solution :
In this case, we can see that each letter is written as its position in the alphabet:
R is the 18th letter, so it is written as 18.
E is the 5th letter, so it is written as 5.
C is the 3rd letter, so it is written as 3.
I is the 9th letter, so it is written as 9.
P is the 16th letter, so it is written as 16.
E is the 5th letter again, so it is written as 5.
Thus, "RECIPE" is written as 18 5 3 9 16 5.
Q9. "HELLO" is coded as 8 5 12 12 15, and "WORLD" is coded as 23 15 18 12 4. Then, what would be the code for "GREAT"?
Solution :
In this case, we can see that each letter is written as its position in the alphabet:
G is the 7th letter, so it is written as 7.
R is the 18th letter, so it is written as 18.
E is the 5th letter, so it is written as 5.
A is the 1st letter, so it is written as 1.
T is the 20th letter, so it is written as 20.
Thus, "GREAT" is written as 7 18 5 1 20.
Q10. "APPLE" is coded as 1 16 16 12 5, and "BANANA" is coded as 2 1 14 1 14 1. Then, what would be the code for "GRAPE"?
Solution :
In this case, we can see that each letter is written as its position in the alphabet:
G is the 7th letter, so it is written as 7.
R is the 18th letter, so it is written as 18.
A is the 1st letter, so it is written as 1.
P is the 16th letter, so it is written as 16.
E is the 5th letter, so it is written as 5.
Thus, "GRAPE" is written as 7 18 1 16 5.
Practice Questions on Coding Decoding
1. If in a certain language, MADRAS is coded as NBESBT, how is BOMBAY coded in that code?
(a) CPNCBX
(b) CPNCBZ
(c) CPOCBZ
(d) CQOCBZ
(e) None of these
2. In a certain code, TRIPPLE is written as SQHOOKD. How is DISPOSE written in that code?
(a) CHRONRD
(b) DSOESPI
(c) ESJTPTF
(d) ESOPSID
(e) None of these
3. If in a code language. COULD is written as BNTKC and MARGIN is written as LZQFHM, how will MOULDING be written in that code?
(a) CHMFINTK
(6) LNKTCHMF
(c) LNTKCHMF
(d) NITKHCMF
(e) None of these
4. In a certain code, MONKEY is written as XDJMNL. How is TIGER written in that code?
(a) QDFHS
(b) SDFHS
(c) SHFDQ
(d) UJHFS
(e) None of these
5. If FRAGRANCE is written as SBHSBODFG, how can IMPOSING be written?
(a) NQPTJHOJ
(b) NQPTJOHI
(c) NQTPJOHJ
(d) NQPTJOHJ
(c) None of these
6.If EXAMPLE is written as FYBNQMF, how can SIMPLE be written?
(a) TJNQMF
(b) TJNPMF
(c) TJOPNF
(d) TJNQME
(e) None of these
7. If KINGDOM is written as LJOHNPF, how can QUEEN be written?
(a) RVFFO
(b) RVGGO
(c) RVFFP
(d) RUGGO
(e) None of these
8. If CRYSTAL is written as DSZUBM, how can GLOWING be written?
(a) HMPXJOH
(b) HMPYJPH
(c) HNPXJPH
(d) HMPXJOG
(e) None of these
9. If BRAIN is written as CSBJO, how can MIND be written?
(a) NJOE
(b) NJOF
(c) MKOG
(d) MJOG
(e) None of these
10. If FLOOD is written as GMPPE, how can RAIN be written?
(a) SBOJ
(b) SBOK
(c) SBOL
(d) SBNJ
(e) None of these
Answer Key
- (b) CPNCBZ
- (a) CHRONRD
- (c) LNTKCHMF
- (a) QDFHS
- (d) NQPTJOHJ
- (a) TJNQMF
- (a) RVFFO
- (a) HMPXJOH
- (a) NJOE
- (a) SBOJ
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