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Coding-Decoding - Advanced Level: mixed coding ADVANCED

Exam-focused holistic practice ★ worksheet: 20 advanced-level coding-decoding questions. Worksheet 23 of 30 targets mixed coding. Build proficiency in number coding, symbol substitution, code breaking with detailed solutions. Ideal for advanced competitive exam preparation.

📝 Worksheet 23 of 30 • 20 questions • ⏱️ Estimated time: 20 minutes • 🎯 Advanced level

What you'll learn in this worksheet:
Your progress through Coding-Decoding
Worksheet 23 of 30 (76% complete)

Question 1

If 'WATER' is coded as 'RETAW', then how is 'HOUSE' coded?
The pattern is reverse coding: WATER → RETAW, so HOUSE → ESUOH
reverse, pattern

Question 2

If 'STAR' is coded as 'UVCT', then how is 'RAT' coded?
The pattern is shifting each letter by +2. So RAT becomes: R(18→20) → A(1→3) → T(20→22) = TCV
shift, basic

Question 3

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

Question 4

If 'DATA' is coded as 'CVCF' using the rule 'reverse the word, then shift each letter by +2', what is the code?
Step 1: Reverse DATA → ATAD, Step 2: Shift +2 → CVCF
mixed, complex

Question 5

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

Question 6

If 'CUP' = 40 and 'SUN' = 54, then 'BUS' = ?
Sum of letter positions: CUP = 3+21+16 = 40, SUN = 19+21+14 = 54, BUS = 2+21+19 = 42
position, sum

Question 7

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

Question 8

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

Question 9

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

Question 10

If A=1, B=2, C=3... Z=26, then 'LOGIC' is coded as?
Converting each letter to its position number: L=12, O=15, G=7, I=9, C=3 → 1215793
numbers, substitution

Question 11

If the code for 'GRASS' is 'SSARG' using the rule 'reverse the word', then what is the original word for the code 'SSARG'?
To decode, reverse the word: SSARG → GRASS
decode, reverse

Question 12

If the code for 'BETA' is 'ATEB' using the rule 'reverse the word', then what is the original word for the code 'ATEB'?
To decode, reverse the word: ATEB → BETA
decode, reverse

Question 13

If A=1, B=2, C=3... Z=26, then 'HELLO' is coded as?
Converting each letter to its position number: H=8, E=5, L=12, L=12, O=15 → 85121215
numbers, substitution

Question 14

If 'MAP' is coded as '30' using the rule 'sum of the positions of all letters', then how is 'JAVA' coded?
Sum of positions: MAP → 30
arithmetic, operations

Question 15

If 'FINAL' is coded as 'JMREP' using the rule 'add 4 to each letter's position' (A=1, B=2, ..., Z=26, wrap around), then how is 'ENCRYPT' coded?
Each letter position +4: FINAL → JMREP
arithmetic, operations

Question 16

If A=1, B=2, C=3... Z=26, then 'EXAM' is coded as?
Converting each letter to its position number: E=5, X=24, A=1, M=13 → 524113
numbers, substitution

Question 17

If 'MUSIC' is coded as 'CISUM', then how is 'DOOR' coded?
The pattern is reverse coding: MUSIC → CISUM, so DOOR → ROOD
reverse, pattern

Question 18

If the code for 'REASON' is 'WJFXTS' using the rule 'each letter shifted forward by 5', then what is the original word for the code 'WJFXTS'?
To decode, shift each letter backward by 5: WJFXTS → REASON
decode, reverse

Question 19

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

Question 20

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