Coding-decoding: letter positions, patterns and tricks

Mock Matrix · mockmatrix.in/

Learn the letter positions

Opposite letters

A letter and its opposite add up to 27: A–Z, B–Y, C–X, D–W, E–V, F–U, G–T, H–S, I–R, J–Q, K–P, L–O, M–N.

Common code types

• Shift: each letter moves forward or back by a fixed number (CAT → DBU is +1).
• Changing shift: +1, +2, +3 … for successive letters.
• Reverse: the word is written backwards, sometimes with a shift.
• Opposite: each letter is replaced by its opposite (GOD → TLW).
• Number codes: letters replaced by positions, sums or products of positions.

Method

1. Write the word and its code one under the other.
2. Find the gap for each letter pair (forward or back).
3. Check whether the gaps are equal, growing or mirrored.
4. Apply the same rule to the new word.

Solved examples

1. If CAT is written as DBU, how is DOG written?
   Each letter +1 → EPH.
2. If ROSE is coded as ILHV, how is LILY coded?
   Each letter is replaced by its opposite: L→O, I→R, L→O, Y→B → OROB.
3. If BAD = 7 (2 + 1 + 4), what is FED?
   6 + 5 + 4 = 15.