Coding Decoding

Coding-Decoding: Easy Study Material with Emojis 🚦

What is Coding-Decoding? 🧩

• Coding: Changing a word or message into a secret code using rules or patterns.
• Decoding: Changing the code back into the original word or message¹.

Key Concepts & Tricks 🗝️

1. Positional Value of Alphabets 🔤

• Forward: A=1, B=2, …, Z=26
• Reverse: Z=1, Y=2, …, A=26
• Memory Tip: “EJOTY” helps you remember 5, 10, 15, 20, 25¹.

2. Letter to Letter Coding 📝

• Letters are changed using operations like addition, subtraction, or interchanging.
• Trick:
  • Check for opposite letters (A↔Z, B↔Y, etc.).
  • Check for position changes or arithmetic operations¹.

3. Letter to Number Coding 🔢

• Assign numbers to letters based on their position or a set rule.
• Sometimes, numbers are manipulated (added, multiplied, etc.)¹.

4. Substitutional Coding 🔄

• Words are replaced with other words.
• Find the answer by tracing the chain of substitutions¹.

5. Chinese (Statement) Coding 🈲

• Words in statements are coded with symbols/words/letters.
• Find the code by matching common words in different statements¹.

6. LSN (Letter, Symbol, Number) Coding 🔣

• Words are coded using a mix of letters, symbols, and numbers.
• Each part (first/last letter, word length) has a coding rule¹.

7. Conditional Coding ⚡

• Coding depends on specific conditions (e.g., first/last letter is a vowel/consonant).
• Apply all conditions step by step¹.

8. Clock Coding 🕒

• Numbers or symbols represent time (hours/minutes).
• Sometimes, binary codes (A=0, B=1) are used for numbers¹.

Step-by-Step Tricks to Crack Coding-Decoding 🧠

1. Check for Opposite Letters:
   • E.g., A↔Z, B↔Y, C↔X…
2. Check for Position Interchange:
   • Are letters swapped or reversed?
3. Check for Arithmetic Operations:
   • Addition, subtraction, multiplication on letter positions or numbers.
4. Check for Substitution:
   • Is a word replaced by another? Follow the chain!
5. For Number Codes:
   • Are numbers the sum of letter positions? Or squares/cubes of word length?

Practice Questions with Detailed Solutions 📝✨

Q1.

If “ENGLISH” is coded as “FOHNHRG”, how is “SCIENCE” coded?

Solution: Apply the same pattern as for “ENGLISH” (each letter is shifted forward by 1): S → T, C → D, I → J, E → G, N → M, C → B, E → D So, “SCIENCE” = TDJGMBD¹ Answer: TDJGMBD ✍️

Q2.

If “FRIEND” is written as “UIRVMW”, how is “TRADER” coded?

Solution: Each letter is replaced by its opposite in the alphabet: T↔G, R↔I, A↔Z, D↔W, E↔V, R↔I So, “TRADER” = GIZWVI¹ Answer: GIZWVI 🔄

Q3.

If “GIVE” is “810236” and “BOND” is “316155”, how is “CREW” coded?

Solution: Each letter is assigned a specific number based on a pattern (see example). C=4, R=19, E=5, W=23, sum or pattern applied as per the code. Following the pattern: 419624¹ Answer: 419624 🔢

Q4.

If “Y” = 50 and “SEA” = 50, what is “YACHT”?

Solution: Y=25; 25×2=50. SEA: (19+5+1)×2=50. YACHT: (25+1+3+8+20)×2 = 57×2 = 114¹ Answer: 114 🚤

Q5.

If “eye” is called “hand”, “hand” is called “mouth”, “mouth” is called “ear”, “ear” is called “nose”, and “nose” is called “tongue”, with which of the following would a person hear?

Solution: We hear with “ear”, but “ear” is called “nose”. Answer: Nose 👃¹

Q6.

If “MONITOR” = 49 and “NARCOTIC” = 64, how is “STUPENDOUS” coded?

Solution: MONITOR has 7 letters, 7²=49. NARCOTIC has 8 letters, 8²=64. STUPENDOUS has 10 letters, 10²=100¹ Answer: 100 💯

Q7.

If “EASY” is written as “5117”, how is “BEAM” written?

Solution: E=5, A=1, S=19 (1+9=10, 1+0=1), Y=25 (2+5=7). So, EASY=5117. BEAM: B=2, E=5, A=1, M=13 (1+3=4). Answer: 2514¹ Answer: 2514 📝

Q8.

If “SPECIAL” is 65, what is “CONNECT”?

Solution: Sum of place values: C=3, O=15, N=14, N=14, E=5, C=3, T=20 Total: 3+15+14+14+5+3+20=74¹ Answer: 74 🔗

Chinese Coding Example 🈳

Given:

• ‘si ta mi’ = ‘Seeta is dancing’
• ‘ge ma ta ki’ = ‘jewellery shop is there’
• ‘si la za’ = ‘Seeta likes sweet’
• ‘za ta ki’ = ‘sweet is there’

Q: Which word means “jewellery”? Solution: ‘ge’ or ‘ma’ (since both only appear with “jewellery”)¹ Answer: ge or ma 💍

Binary (Clock) Coding Example ⏰

A=0, B=1, BA=2, BB=3, BAA=4, BAB=5, … Q: What is the average of BBBB and BBBBB?

• BBBB = 1111 (binary) = 15
• BBBBB = 11111 (binary) = 31 Average = (15+31)/2 = 23¹ Answer: 23 🕒

Quick Tips & Memory Aids 💡

• Use “EJOTY” for quick reference to alphabet positions.
• Always check for opposite letters or position-based patterns.
• For substitution, follow the chain until you reach the answer.
• For number codes, check if it’s a sum, square, or manipulation of letter positions.
• For Chinese coding, match common words across statements.

Happy Practicing! 🎉 Try to solve more coding-decoding questions using these tricks and emojis for quick recall! If you want more practice or have a specific type of coding-decoding question, just ask!

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