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Coding-Decoding - Intermediate Level: complex coding INTERMEDIATE

Boost your speed and accuracy with this adaptive style 📈 worksheet. Worksheet 15 of 30 presents 20 intermediate-level coding-decoding problems. Focus on complex coding while practicing letter coding, number coding, symbol substitution. Difficulty: moderate complexity with mixed patterns. Perfect for mid-level test takers.

📝 Worksheet 15 of 30 • 20 questions • ⏱️ Estimated time: 20 minutes • 🎯 Intermediate level

What you'll learn in this worksheet:
Your progress through Coding-Decoding
Worksheet 15 of 30 (50% complete)

Question 1

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

Question 2

If 'VERIFY' is coded as 'YHULIB' using the rule 'shift each letter by +1, then shift again by +2', what is the code?
Step 1: Shift +1 VERIFY → WFSJGZ, Step 2: Shift +2 → YHULIB
mixed, complex

Question 3

If 'CHAIR' is coded as 'RIAHC', then how is 'WINDOW' coded?
The pattern is reverse coding: CHAIR → RIAHC, so WINDOW → WODNIW
reverse, pattern

Question 4

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

Question 5

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

Question 6

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

Question 7

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

Question 8

If A=1, B=2, C=3... Z=26, then 'CODE' is coded as?
Converting each letter to its position number: C=3, O=15, D=4, E=5 → 31545
numbers, substitution

Question 9

If 'APPLICATION' is coded as 'WLLHEYWPEKJ' using the rule 'subtract 4 from each letter's position' (A=1, B=2, ..., Z=26, wrap around), then how is 'JAR' coded?
Each letter position -4: APPLICATION → WLLHEYWPEKJ
arithmetic, operations

Question 10

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 11

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 12

If 'DOG' is coded as 'GRJ', then how is 'MOON' coded?
The pattern is shifting each letter by +3. So MOON becomes: M(13→16) → O(15→18) → O(15→18) → N(14→17) = PRRQ
shift, basic

Question 13

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

Question 14

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 15

If 'MOON' is coded as 'NPPO', then how is 'BAT' coded?
The pattern is shifting each letter by +1. So BAT becomes: B(2→3) → A(1→2) → T(20→21) = CBU
shift, basic

Question 16

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

Question 17

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

Question 18

If 'HAT' is coded as '29' using the rule 'sum of the positions of all letters', then how is 'BAG' coded?
Sum of positions: HAT → 29
arithmetic, operations

Question 19

If 'KEY' = 41 and 'CAR' = 22, then 'BAG' = ?
Sum of letter positions: KEY = 11+5+25 = 41, CAR = 3+1+18 = 22, BAG = 2+1+7 = 10
position, sum

Question 20

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