Example 1 · level 1
In a certain code, COST is written as DPTU. How is DEBIT written in that code?
- UJCFE
- FGDKV
- EFCJU
- CDAHS
Show solution
- Each letter moves 1 place forward (C → D).
- DEBIT → EFCJU.
Answer: EFCJU
CA FOUNDATION: QUANTITATIVE APTITUDE · LOGICAL REASONING
Logical reasoning: coding-decoding
Compare each letter with its code: find the shift (A→D is +3) or the opposite-letter rule (A↔Z, B↔Y: positions add to 27).
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Worked examples
Example 2 · level 2
In a certain code, FUND is written as DSLB. How is STOCK written in that code?
- PQLZH
- RSNBJ
- QRMAI
- UVQEM
Show solution
- Each letter moves 2 places backward (F → D).
- STOCK → QRMAI.
Answer: QRMAI
Example 3 · level 3
In a certain code, TAX is written as GZC. How is CASH written in that code?
- XZHS
- SHZX
- HSAC
- DBTI
Show solution
- Each letter is replaced by its opposite letter in the alphabet (A↔Z, B↔Y, …; positions add to 27).
- CASH → XZHS.
Answer: XZHS