Top 18 Coding Decoding Questions for SSC CGL – Must-Do For Repeaters
Practice the toughest Coding & Decoding patterns for SSC CGL. Interactive questions with hidden step-by-step solutions and quick tricks.
Study Material/Reasoning/Coding Decoding
Top 18 Coding Decoding Questions for SSC CGL
Practice the toughest logical patterns that appear in the Reasoning section. Click on the options to lock in your answer, then reveal the solution.
Warning: Not For Freshers
These are the absolute best Coding & Decoding questions for repeaters and serious aspirants who want to push their reasoning score to a perfect 50/50. These are the exact questions that can stop you from scoring full marks.
If you are a fresher, we recommend starting with basic patterns first. But if you have given SSC CGL before and keep getting stuck on tricky logic, these 18 highly-tested frameworks are mandatory. Test yourself by tapping an option to see if you are right!
Question 1
In a certain code language, 'ADD' is coded as 16 and 'DOG' is coded as 420. How will 'HEN' be coded in that language?
ADD → 16, HEN → ?
✅
Correct Answer: D) 560
Step-by-Step Solution
The code is the product of the alphabet positions.
ADD = 1 × 4 × 4 = 16.
HEN = 8 × 5 × 14.
560
💡 Quick Trick
For a three-letter word with a large code, test: Product of alphabet positions.
Question 2
In a coded language, 'LEMAC' is written as 'CALF'. Then, how will 'TAOG' be written in the same language?
LEMAC → CALF, TAOG → ?
✅
Correct Answer: D) KID
Step-by-Step Solution
The word LEMAC written in reverse becomes CAMEL. A baby camel is called a CALF.
Similarly: TAOG → GOAT. A baby goat is called a KID.
KID
💡 Quick Trick
This is a reverse word + relationship question.
Question 3
In a coded language, 'ADOPT' is written as 'NPLKE'. In the same language, 'BLEND' is written as 'RSGDP'. Then, how is 'PLANE' written in the same language?
ADOPT → NPLKE, PLANE → ?
✅
Correct Answer: B) KSNDG
Step-by-Step Solution
Here, each letter has a fixed substitution from the examples.
P → K, L → S, A → N, N → D, E → G
KSNDG
💡 Quick Trick
When two words and their codes are given, check whether each letter has a fixed one-to-one replacement.
Question 4
In a coded language, 'JUDGMENT' is written as 'FGMNQTVW'. Then, how will 'TRANSFER' be written in the same language?
JUDGMENT → FGMNQTVW, TRANSFER → ?
✅
Correct Answer: C) GHIIMUVZ
Step-by-Step Solution
First replace every letter with its opposite letter in the alphabet (A↔Z, B↔Y). Then arrange in alphabetical order.
TRANSFER opposites → GIZMHUVI.
Arrange alphabetically: G H I I M U V Z
GHIIMUVZ
💡 Quick Trick
When the coded result contains the same number of letters, check: Opposite letters → Alphabetical arrangement.
Question 5
In a coded language, 'PUBLICLY' is written as 'UPMCCIZM'. Then, how will 'REVIEWED' be written in the same language?
PUBLICLY → UPMCCIZM
✅
Correct Answer: D) ERJWWEEF
Step-by-Step Solution
Divide the word into pairs. The rule alternates: Pair 1 (Reverse), Pair 2 (Reverse + 1).
REVIEWED → RE | VI | EW | ED
Pair 1: RE → ER Pair 2: VI → IV + 1 → JW Pair 3: EW → WE Pair 4: ED → DE + 1 → EF
In a certain code language, 'PURITAN' is coded as '323621912840' and 'CULPRIT' is coded as '624213293640'. How will 'RAMBLES' be coded in that language?
PURITAN → 323621912840
✅
Correct Answer: A) 12636452438
Step-by-Step Solution
The first 3 letters and last 3 letters are arranged in alphabetical order. Then: Consonants × 2, Vowels unchanged.
RAMBLES → First three (R, A, M) → A, M, R. Last three (L, E, S) → E, L, S. New order: A M R B E L S
Values: A=1, M=26, R=36, B=4, E=5, L=24, S=38.
12636452438
💡 Quick Trick
When the code is a long string of numbers, check whether letters are rearranged → then converted into alphabet values.
Question 8
In a coded language, 'FROZEN' is written as 'RAKDST'. In the same language, 'KABUTO' is written as 'EZVLIK'. Then, how will 'NEZUKO' be written?
FROZEN → RAKDST, NEZUKO → ?
✅
Correct Answer: A) TSDLEK
Step-by-Step Solution
This is a direct letter-substitution question. Build the map from the examples.
N → T, E → S, Z → D, U → L, K → E, O → K
TSDLEK
💡 Quick Trick
When two coded examples provide a direct letter-to-letter mapping, don't search for a mathematical pattern.
Question 9
In a certain code language, 'SOURCE' is coded as 9 and 'TRAIN' is coded as 8. How will 'LONELY' be coded in that language?
SOURCE → 9, LONELY → ?
✅
Correct Answer: A) 2
Step-by-Step Solution
Find the sum of alphabet positions, then take the digit sum.
Pattern: Reverse the word → Replace with opposite alphabet letters.
Question 15
In a certain code language, 'KNIFE' is coded as 180. How will 'ASSURE' be written in that code language?
KNIFE → 180, ASSURE → ?
✅
Correct Answer: C) 237
Step-by-Step Solution
The word is coded using: Reverse positional value × number of vowels
For KNIFE (K→16, N→13, I→18, F→21, E→22): Sum: 16 + 13 + 18 + 21 + 22 = 90 Number of vowels = 2 90 × 2 = 180
For ASSURE (A→26, S→8, S→8, U→6, R→9, E→22): Sum: 26 + 8 + 8 + 6 + 9 + 22 = 79 Number of vowels = 3
79 × 3 = 237
💡 Quick Trick
When the given code is a number, first test: Alphabet sum × number of vowels/consonants.
Question 16
In a coded language, 'ROVERS' is written as 'TELIVU'. Then, how will 'SOARED' be written in the same language?
ROVERS → TELIVU, SOARED → ?
✅
Correct Answer: C) UZLIVF
Step-by-Step Solution
Outer consonants are shifted +2. Middle letters are replaced by their opposite alphabet letters.
SOARED: S+2=U, O→L, A→Z, R→I, E→V, D+2=F.
UZLIVF
💡 Quick Trick
Look for opposite-letter coding combined with a fixed shift.
Question 17
In a certain code language, 'LUSTRE' is coded as '95'. How will 'MAGNET' be coded in that language?
LUSTRE → 95, MAGNET → ?
✅
Correct Answer: B) 60
Step-by-Step Solution
The code is the sum of alphabet positions.
LUSTRE = 12 + 21 + 19 + 20 + 18 + 5 = 95
MAGNET = 13 + 1 + 7 + 14 + 5 + 20 = 60
60
💡 Quick Trick
If the code is a relatively simple number, immediately test: Sum of alphabet positions.
Question 18
In a certain code language, 'DEN' is coded as 530 and 'MAG' is coded as 442. How will 'ARC' be coded in that language?
DEN → 530, ARC → ?
✅
Correct Answer: D) 485
Step-by-Step Solution
The rule is: (Sum of alphabet positions)² + 1
DEN = 4 + 5 + 14 = 23. 23² + 1 = 529 + 1 = 530.
ARC = 1 + 18 + 3 = 22. 22² + 1 = 484 + 1.
485
💡 Quick Trick
If the code is around 400–600 for a three-letter word, test: (alphabet sum)² ± 1.
📋
Checklist
Coding-Decoding Pattern Sheet
Before solving a question, quickly test these patterns in order:
1. Simple Numerical Code
Sum of alphabet positions
2. Large Numerical Code
Product or square of alphabet sum
3. Reverse Alphabet
A↔Z, B↔Y, etc.
4. Letter Rearrangement
Compare positions of original and new word
5. Vowel/Consonant Coding
Different operations (+3, -5)
6. Fixed Substitution
Map each letter directly from examples
⚡ 10-Second SSC CGL Approach
When you see a new coding question, don't immediately start calculating. If the answer is a number, try alphabet sum. If it's a word, check letter positions and reverse order immediately. Eliminate unnecessary calculations.