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Coding-Decoding - Beginner Level: symbol substitution BEGINNER

Exam-focused quick revision round worksheet: 20 beginner-level coding-decoding questions. Worksheet 3 of 30 targets symbol substitution. Build proficiency in symbol substitution, code breaking, pattern decoding with detailed solutions. Ideal for entry-level competitive exam preparation.

📝 Worksheet 3 of 30 • 20 questions • ⏱️ Estimated time: 20 minutes • 🎯 Beginner level

What you'll learn in this worksheet:
Your progress through Coding-Decoding
Worksheet 3 of 30 (10% complete)

Question 1

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

Question 2

If 'MAP' = 30 and 'BUS' = 42, then 'CAT' = ?
Sum of letter positions: MAP = 13+1+16 = 30, BUS = 2+21+19 = 42, CAT = 3+1+20 = 24
position, sum

Question 3

If 'BOX' is coded as 'DQZ', then how is 'KEY' coded?
The pattern is shifting each letter by +2. So KEY becomes: K(11→13) → E(5→7) → Y(25→1) = MGA
shift, basic

Question 4

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

Question 5

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

Question 6

If 'KEY' = 41 and 'BOX' = 41, then 'DOG' = ?
Sum of letter positions: KEY = 11+5+25 = 41, BOX = 2+15+24 = 41, DOG = 4+15+7 = 26
position, sum

Question 7

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 8

If A=1, B=2, C=3... Z=26, then 'PYTHON' is coded as?
Converting each letter to its position number: P=16, Y=25, T=20, H=8, O=15, N=14 → 16252081514
numbers, substitution

Question 9

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

Question 10

If 'BUS' = 42 and 'BAG' = 10, then 'PEN' = ?
Sum of letter positions: BUS = 2+21+19 = 42, BAG = 2+1+7 = 10, PEN = 16+5+14 = 35
position, sum

Question 11

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

Question 12

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

Question 13

In a certain code, vowels are coded as A=1,E=2,I=3,O=4,U=5. How is 'EXAM' coded?
Vowels: EA become numbers: 2X1M
conditional, vowels

Question 14

If 'RAT' is coded as 'TCV', 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 15

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

Question 16

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

Question 17

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

Question 18

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 19

If the code for 'BOOK' is 'B44K' using the rule 'vowels replaced by numbers (A=1,E=2,I=3,O=4,U=5)', then what is the original word for the code 'B44K'?
To decode, replace numbers back to vowels: B44K → BOOK
decode, reverse

Question 20

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