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Question

If in a specific coding system, DOG is coded as 231220, CAT is coded as 24267, and BIRD is coded as 2518923, then following this numerical coding pattern, what would FISH be coded as?

This question was previously asked in
SSC CHSL 2025 Tier 1 Question Paper (21-Nov-2025) (Shift 1)
The correct answer is

2118819

We are given code numbers for DOG, CAT and BIRD, and we must find the code for FISH using the same rule.

The rule replaces each letter by its reverse position in the alphabet, i.e. position value = 27 minus the normal position (A=26, B=25, ... , Z=1).

Check with DOG: D = 23, O = 12, G = 20, which written together give 23-12-20 = 231220. This matches the given code.

Check with CAT: C = 24, A = 26, T = 7, giving 24-26-7 = 24267. This also matches.

Check with BIRD: B = 25, I = 18, R = 9, D = 23, giving 25-18-9-23 = 2518923. Confirmed.

Now apply the rule to FISH: F = 21, I = 18, S = 8, H = 19.

Joining these reverse positions in order gives 21-18-8-19 = 2118819.

Therefore the code for FISH is 2118819.

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  1. If ‘Monday’ is encrypted as 123456 and ‘Belt’ is encrypted as 0789, how would you encrypt the word ‘Tombay’?

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  3. If 31 L 31 J 5 = 186 and 47 J 2 L 43 = 137, then 52 L 64 J 3 = ?

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