Coding-Decoding
0/10 problems solved
Formulas & 30-Second Shortcut Tricks
Formulas
- Letter positions: A=1 … Z=26; reverse position = 27 − n
- EJOTY trick: E=5, J=10, O=15, T=20, Y=25
- Opposite pairs (sum 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
Shortcuts
- Compare the first letter of word and code — find the shift, then confirm on the last letter.
- If shifts differ per letter, look for +1, +2, +3… or alternating patterns.
- Reversed codes: check if the code read backwards matches a simple shift.
Practice problems
Q1
If MOUSE is coded as OQWUG, how is CAT coded?
Q2
If PLANT is coded as LHWJP, how is BOOK coded?
Q3
In a code, MOUSE is written as NLFHV. How is DELHI written?
Q4
If WATER is coded as UYRCP, how is MOUSE coded?
Q5
If SMART is coded as WQEVX, how is PLANT coded?
Q6
In a code, WATER is written as DZGVI. How is TABLE written?
Q7
If LIGHT is coded as NKIJV, how is WATER coded?
Q8
If CAT is coded as BZS, how is SMART coded?
Q9
In a code, LIGHT is written as ORTSG. How is CODE written?
Q10
If DELHI is coded as ZAHDE, how is LIGHT coded?
Coding-Decoding Speed Test
1 minute per question. Use the palette to jump around; you'll see time spent on every question at the end.