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Coding-Decoding - Advanced Level: reverse coding ADVANCED

Quick competitive exam prep session: 20 advanced-level coding-decoding questions. Worksheet 27 of 30 - Focus: reverse coding. Practice cipher solving, encoding rules, decoding techniques with instant feedback. Great for advanced students needing complex scenarios and multi-step problems practice.

📝 Worksheet 27 of 30 • 20 questions • ⏱️ Estimated time: 20 minutes • 🎯 Advanced level

What you'll learn in this worksheet:
Your progress through Coding-Decoding
Worksheet 27 of 30 (90% complete)

Question 1

If 'DOG' is coded as 'FQI', then how is 'CAT' coded?
The pattern is shifting each letter by +2. So CAT becomes: C(3→5) → A(1→3) → T(20→22) = ECV
shift, basic

Question 2

In a certain code, each vowel is replaced by the next letter (A→B, E→F, I→J, O→P, U→V). How is 'NOTE' coded?
Vowels shifted forward: NOTE → NPTF
conditional, vowels

Question 3

If 'CAT' is coded as 'ECV', then how is 'PEN' coded?
The pattern is shifting each letter by +2. So PEN becomes: P(16→18) → E(5→7) → N(14→16) = RGP
shift, basic

Question 4

If A=1, B=2, C=3... Z=26, then 'WORLD' is coded as?
Converting each letter to its position number: W=23, O=15, R=18, L=12, D=4 → 231518124
numbers, substitution

Question 5

If 'OMEGA' is coded as '41' using the rule 'sum of the positions of all letters', then how is 'BOOK' coded?
Sum of positions: OMEGA → 41
arithmetic, operations

Question 6

In a certain code, each consonant is replaced by the previous letter (B→A, C→B, etc.). How is 'TEXT' coded?
Consonants shifted backward: TEXT → SEWS
conditional, vowels

Question 7

If 'LIP' = 37 and 'BAG' = 10, then 'DOG' = ?
Sum of letter positions: LIP = 12+9+16 = 37, BAG = 2+1+7 = 10, DOG = 4+15+7 = 26
position, sum

Question 8

In a certain code, vowels become next consonant, consonants become next vowel. How is 'CERTIFICATE' coded?
Swapping vowel/consonant roles: CERTIFICATE → EFUUJIJEBUF
conditional, vowels

Question 9

If A=1, B=2, C=3... Z=26, then 'WORLD' is coded as?
Converting each letter to its position number: W=23, O=15, R=18, L=12, D=4 → 231518124
numbers, substitution

Question 10

If in a code, A↔Z, B↔Y, C↔X, etc. (each letter replaced by its opposite), then 'CONSTANT' becomes 'XLMHGZMG'. How is 'TOE' coded?
Opposite of TOE: TOE → GLV
opposite, mirror

Question 11

If the code for 'CPLUSPLUS' is 'DQMVTQMVT' using the rule 'each letter shifted forward by 1', then what is the original word for the code 'DQMVTQMVT'?
To decode, shift each letter backward by 1: DQMVTQMVT → CPLUSPLUS
decode, reverse

Question 12

If 'BOOK' is coded as 'FSSG' using the rule 'multiply each letter's position by 3' (A=1, B=2, ..., Z=26, wrap around), then how is 'DECRYPT' coded?
Each letter position ×3: BOOK → FSSG
arithmetic, operations

Question 13

If 'PROCESS' is coded as 'NPMACQQ' using the rule 'subtract 2 from each letter's position' (A=1, B=2, ..., Z=26, wrap around), then how is 'BEE' coded?
Each letter position -2: PROCESS → NPMACQQ
arithmetic, operations

Question 14

In a certain code, vowels are coded as A=1,E=2,I=3,O=4,U=5. How is 'HIDDEN' coded?
Vowels: IE become numbers: H3DD2N
conditional, vowels

Question 15

If A=1, B=2, C=3... Z=26, then 'BRAIN' is coded as?
Converting each letter to its position number: B=2, R=18, A=1, I=9, N=14 → 2181914
numbers, substitution

Question 16

If 'WORD' is coded as 'WILD' using the rule 'replace each letter with its opposite (A↔Z, B↔Y), then reverse', what is the code?
Step 1: Opposite WORD → DLIW, Step 2: Reverse → WILD
mixed, complex

Question 17

If 'PENCIL' is coded as 'LICNEP', then how is 'ROOM' coded?
The pattern is reverse coding: PENCIL → LICNEP, so ROOM → MOOR
reverse, pattern

Question 18

If the code for 'PYTHON' is 'KBGSLM' using the rule 'each letter replaced by its opposite (A↔Z, B↔Y)', then what is the original word for the code 'KBGSLM'?
To decode, apply opposite again: KBGSLM → PYTHON
decode, reverse

Question 19

If in a code, A↔Z, B↔Y, C↔X, etc. (each letter replaced by its opposite), then 'WATER' becomes 'DZGVI'. How is 'PRIME' coded?
Opposite of PRIME: PRIME → KIRNV
opposite, mirror

Question 20

In a certain code, vowels become next consonant, consonants become next vowel. How is 'CERTIFICATE' coded?
Swapping vowel/consonant roles: CERTIFICATE → EFUUJIJEBUF
conditional, vowels
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