Another digit substitution — Aptitude Question
Another digit substitution: If PALE is coded as 2134 and EARTH as 41590, how is PEARL coded? Answer and worked solution on CodeKairo.
- Topic: Coding & Decoding
- Section: Logical Reasoning
- Difficulty: Medium
- Time target: 105 seconds
Question
If PALE is coded as 2134 and EARTH as 41590, how is PEARL coded?
Options
- 24153
- 215394
- 241539
- 241593
Show the answer and the worked solution
Correct answer: A. 24153
Worked solution
- PALE → P=2, A=1, L=3, E=4.
- EARTH → E=4 (consistent), A=1 (consistent), R=5, T=9, H=0.
- PEARL = P,E,A,R,L = 2,4,1,5,3 = 24153.
Answer: 24153.
The idea
Check the answer's length against the word's — PEARL has five letters, so the code has five digits. Here that alone rules out every other option; usually it removes one or two before any decoding.
Shortcut. P = 2 and E = 4 fix the opening 24, which already removes 215394; the code stops at L = 3 because PEARL has only five letters, leaving 24153.
Common trap. "241539" — it opens with the correct 2415, so a candidate matching only the first few digits picks it; it has six digits for a five-letter word.