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Coding-Decoding - Intermediate Level: symbol substitution INTERMEDIATE

Comprehensive weakness targeting worksheet covering 20 intermediate-level coding-decoding problems. Worksheet 18 of 30 emphasizes symbol substitution. Master code breaking, pattern decoding, cipher solving through detailed explanations. Difficulty: moderate complexity with mixed patterns. Tailored for mid-level preparation.

📝 Worksheet 18 of 30 • 20 questions • ⏱️ Estimated time: 20 minutes • 🎯 Intermediate level

What you'll learn in this worksheet:
Your progress through Coding-Decoding
Worksheet 18 of 30 (60% complete)

Question 1

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

Question 2

If 'PEN' is coded as 'NEP', then how is 'CEILING' coded?
The pattern is reverse coding: PEN → NEP, so CEILING → GNILIEC
reverse, pattern

Question 3

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

Question 6

If 'KEY' = 41 and 'HAT' = 29, then 'CAR' = ?
Sum of letter positions: KEY = 11+5+25 = 41, HAT = 8+1+20 = 29, CAR = 3+1+18 = 22
position, sum

Question 7

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

Question 8

If 'VALUE' is coded as 'VFOZE' using the rule 'reverse the word, then replace each letter with its opposite', what is the code?
Step 1: Reverse VALUE → EULAV, Step 2: Opposite → VFOZE
mixed, complex

Question 9

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

Question 10

If 'KEY' is coded as 'LFZ', then how is 'MOON' coded?
The pattern is shifting each letter by +1. So MOON becomes: M(13→14) → O(15→16) → O(15→16) → N(14→15) = NPPO
shift, basic

Question 11

If 'FAN' = 21 and 'BAG' = 10, then 'BUS' = ?
Sum of letter positions: FAN = 6+1+14 = 21, BAG = 2+1+7 = 10, BUS = 2+21+19 = 42
position, sum

Question 12

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

Question 13

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

Question 14

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 15

If 'LIP' = 37 and 'DOG' = 26, then 'CAT' = ?
Sum of letter positions: LIP = 12+9+16 = 37, DOG = 4+15+7 = 26, CAT = 3+1+20 = 24
position, sum

Question 16

If 'RAT' = 39 and 'FAN' = 21, then 'CUP' = ?
Sum of letter positions: RAT = 18+1+20 = 39, FAN = 6+1+14 = 21, CUP = 3+21+16 = 40
position, sum

Question 17

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

Question 18

If 'TEXT' is coded as 'GCVG' using the rule 'reverse the word, then replace each letter with its opposite', what is the code?
Step 1: Reverse TEXT → TXET, Step 2: Opposite → GCVG
mixed, complex

Question 19

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

Question 20

If 'DOG' = 26 and 'BUS' = 42, then 'KEY' = ?
Sum of letter positions: DOG = 4+15+7 = 26, BUS = 2+21+19 = 42, KEY = 11+5+25 = 41
position, sum
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