Cracking Secret Codes

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What this quiz asks

1. If A=1, B=2, and C=3, what number represents the letter E using Alphabet Number Mapping?
2. Using Alphabet Number Mapping where A=1, what is the sum of the numbers for the letters C and D?
3. If the word 'BAD' is written as 2-1-4, what is the value of 'B' + 'A' + 'D' in Alphabet Number Mapping?
4. If 'C' is 3 and 'E' is 5, what is the difference between 'E' and 'C' in Alphabet Number Mapping?
5. If the letter A is shifted by 3 positions (A=0, B=1, C=2, D=3), what letter does A become?
6. A cipher uses a shift of 5. If the letter F (position 5) is shifted, what is the new position number?
7. The letter K is at position 10. Using a shift of 4, what is the new position?
8. If the letter B (pos 1) is shifted by 6, and then by 2, what is the final position?
9. If a cipher uses a subtraction key of 3, what is the original letter for the encoded letter 'D'? (A=1, B=2, C=3, D=4...)
10. The letter 'J' is 10. With a subtraction key of 5, what is the decoded letter?
11. Encoded word 'M-O'. Subtraction key is 10. What is the decoded word?
12. If 'R' is 18 and 'S' is 19, and the subtraction key is 15, what are the decoded letters?
13. A repeating cipher uses the sequence 2, 4, 6, 2, 4, 6. If this pattern repeats, what is the 7th number in the sequence?
14. A secret code adds 3, then subtracts 1, then adds 3, then subtracts 1. If the sequence starts at 10, what is the 5th number?
15. A cipher pattern uses the rule: multiply by 2, then add 5. Starting with 1, what is the 3rd number in the sequence?
16. A pattern alternates between adding 2 and multiplying by 3. If the sequence is 4, 6, 18, 20, 60, what is the next number?
17. In a secret message, the letter 'E' appears 12 times and 'X' appears 1 time. If the total length is 50, what is the frequency percentage of 'E'?
18. A cipher uses a shift of +3. If the letter 'A' is the most frequent character in the cipher, which plain letter does it likely represent?
19. A message has 100 letters. 'Q' appears 20 times. If the expected frequency of 'E' is 13%, how many more 'Q's are there than expected 'E's?
20. In a 200-letter text, 'Z' appears 40 times. If 'Z' represents 'E' (which should be 13%), what is the difference between the actual and expected count?
21. To decode a message, first add 3 to each letter's position, then subtract 1. If the letter is C (position 3), what is the final position?
22. A cipher shifts letters forward by 5 and then back by 2. If the letter is G (position 7), what is the new position?
23. A two-step cipher adds 4 then multiplies by 2. If the start is 3, what is the result?
24. A cipher uses the formula (Position - 2) × 3. If the position is 6, what is the final value?

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