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Coding-Decoding - Advanced Level: conditional coding ADVANCED

Level up your coding-decoding skills with this challenging mix. 20 advanced-level problems await in Worksheet 24 of 30. Focus area: conditional coding. Learn symbol substitution, code breaking, pattern decoding through systematic practice. Designed for advanced learners seeking complex scenarios and multi-step problems.

📝 Worksheet 24 of 30 • 20 questions • ⏱️ Estimated time: 20 minutes • 🎯 Advanced level

What you'll learn in this worksheet:
Your progress through Coding-Decoding
Worksheet 24 of 30 (80% complete)

Question 1

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

Question 2

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

Question 3

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

Question 4

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

Question 5

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 6

If 'FAN' = 21 and 'BAG' = 10, then 'KEY' = ?
Sum of letter positions: FAN = 6+1+14 = 21, BAG = 2+1+7 = 10, KEY = 11+5+25 = 41
position, sum

Question 7

If 'MAP' is coded as 'QET', then how is 'LIP' coded?
The pattern is shifting each letter by +4. So LIP becomes: L(12→16) → I(9→13) → P(16→20) = PMT
shift, basic

Question 8

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

Question 9

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

Question 10

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

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 'LIP' is coded as 'PMT', then how is 'MOON' coded?
The pattern is shifting each letter by +4. So MOON becomes: M(13→17) → O(15→19) → O(15→19) → N(14→18) = QSSR
shift, basic

Question 13

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

Question 14

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

Question 15

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

Question 16

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

Question 17

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

Question 18

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

Question 19

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 20

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