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Difficulty: MediumCoding and Decoding

An autonomous delivery drone navigation system encodes geographic sector names into numerical strings for secure broadcasting. The sector name "DELTA" is transmitted as 46-44-30-14-52, and the sector name "BRAVO" is transmitted as 50-18-52-10-24. Based on this logic, which numerical string represents the sector name "EAGLE"?

  1. 44-52-40-30-44Answer
  2. B
    10-2-14-24-10
  3. C
    22-26-20-15-22
  4. D
    42-50-38-28-42

Answer

The string 44-52-40-30-44 correctly represents the sector name EAGLE.
The correct answer accurately applies the coding logic: it determines the reverse alphabetical position of each letter (found by subtracting the forward position from 27) and multiplies that value by 2. For the word EAGLE: E is 5th, so its reverse is 22 (22 × 2 = 44). A is 1st, reverse is 26 (26 × 2 = 52). G is 7th, reverse is 20 (20 × 2 = 40). L is 12th, reverse is 15 (15 × 2 = 30). Combining these gives 44-52-40-30-44.

Step-by-Step Solution

1
Analyze the numerical values assigned to the letters in 'DELTA' and 'BRAVO' to find the base transformation.
D corresponds to 46, E to 44, L to 30, T to 14, and A to 52.
Identifying the relationship between the first few letters and their numerical outputs reveals the underlying logic.
2
Determine the mathematical rule applied to the alphabetical positions.
The forward position of D is 4. Its reverse position (27 - 4) is 23. Multiplying 23 by 2 gives 46. This logic holds for all letters.
A consistent pattern must be established that works for every letter in both provided examples.
3
Apply the established logic to the target word 'EAGLE'.
E (5) -> reverse 22 -> 44. A (1) -> reverse 26 -> 52. G (7) -> reverse 20 -> 40. L (12) -> reverse 15 -> 30. E (5) -> reverse 22 -> 44.
Applying the exact rule ensures the correct encryption of the target string.

Key Concept

Reverse Alphabetical Indexing and Mathematical Transformation
Estimated Time:1m 30s
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Topics

Coding and Decoding

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