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Coding-Decoding - Intermediate Level: letter coding INTERMEDIATE

Master coding-decoding concepts through this excellence pursuit practice set. Worksheet 16 of 30 contains 20 intermediate-level problems. Deep dive into letter coding while learning number coding, symbol substitution, code breaking. Recommended for mid-level learners aiming for moderate complexity with mixed patterns.

📝 Worksheet 16 of 30 • 20 questions • ⏱️ Estimated time: 20 minutes • 🎯 Intermediate level

What you'll learn in this worksheet:
Your progress through Coding-Decoding
Worksheet 16 of 30 (53% complete)

Question 1

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

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 'PYTHON' coded?
Vowels shifted forward: PYTHON → PYTHPN
conditional, vowels

Question 3

If A=1, B=2, C=3... Z=26, then 'TEST' is coded as?
Converting each letter to its position number: T=20, E=5, S=19, T=20 → 2051920
numbers, substitution

Question 4

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

Question 5

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

Question 6

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

Question 7

If 'MOON' is coded as 'QSSR', then how is 'HAT' coded?
The pattern is shifting each letter by +4. So HAT becomes: H(8→12) → A(1→5) → T(20→24) = LEX
shift, basic

Question 8

If 'FLOW' is coded as '56' using the rule 'sum of the positions of all letters', then how is 'PLANT' coded?
Sum of positions: FLOW → 56
arithmetic, operations

Question 9

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

Question 10

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 11

If 'EAR' is coded as '24' using the rule 'sum of the positions of all letters', then how is 'FILE' coded?
Sum of positions: EAR → 24
arithmetic, operations

Question 12

If 'SECRET' is coded as '70' using the rule 'sum of the positions of all letters', then how is 'DECODE' coded?
Sum of positions: SECRET → 70
arithmetic, operations

Question 13

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

Question 14

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 15

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

Question 16

If 'KEY' = 41 and 'MAP' = 30, then 'PEN' = ?
Sum of letter positions: KEY = 11+5+25 = 41, MAP = 13+1+16 = 30, PEN = 16+5+14 = 35
position, sum

Question 17

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

Question 18

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 19

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 20

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
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