Coding-Decoding: MAH CET, NMAT and SNAP practice questions

Solution

Reverse the word and move each letter 1 place backward: NIGHT → THGIN → SGFHM.

TRAIN → NIART → MHZQS.

Solution

The letters are swapped in pairs: SI LV ER → IS VL RE.

So RABBIT → ARBBTI.

Solution

Letters in odd positions move 1 forward and letters in even positions move 1 back: ISLAND → JRMZOC.

So TIGER → UHHDS.

Solution

Each letter is replaced by its opposite letter (A↔Z, B↔Y, C↔X, …; the positions add up to 27).

MARKET → NZIPVG.

Solution

Split the word into two halves and reverse each: HON | EST → NOH | TSE.

So GOLDEN → LOGNED.

Solution

Each letter of SCHOOL moves 1 place forward: S → T, C → D, …

So MIRROR → NJSSPS.

Solution

The 1st letter moves 1 place forward, the 2nd 2 places, the 3rd 3 places, and so on: DOCTOR → EQFXTX.

So CLOUD → DNRYI.

Solution

Each letter is replaced by its position counted from A (A = 1): C = 3, L = 12, …

So EAGLE = 5-1-7-12-5.

Solution

Coding moves each letter 3 places forward, so decoding moves each letter 3 places backward.

VLOYHU → SILVER.

Solution

Each letter of KITTEN moves 2 places forward: K → M, I → K, …

So DOCTOR → FQEVQT.

Solution

'fresh' is common to the first two sentences, so its code is the one common to their codes: ta.

'the' is common to the second and third: ne.

The remaining word in the second sentence is 'red', so its code is bi.

Solution

Letters in odd positions move 2 forward and letters in even positions move 2 back: FRUIT → HPWGV.

So TABLE → VYDJG.

Solution

The 1st letter moves 1 place forward, the 2nd 2 places, the 3rd 3 places, and so on: FOREST → GQUIXZ.

So FRUIT → GTXMY.

Solution

Split the word into two halves and reverse each: SCH | OOL → HCS | LOO.

So JUNGLE → NUJELG.

Solution

The code is the sum of the letter positions plus the number of letters: for PLANET, the positions add to 68, giving 74.

For CLOUD: 3 + 12 + 15 + 21 + 4 = 55, giving 60.

Solution

Each letter is replaced by its opposite letter (A↔Z, B↔Y, C↔X, …; the positions add up to 27).

CAMPUS → XZNKFH.

Solution

Reverse the word (NIART), move each letter 2 places forward (PKCTV), then move the first letter to the end (KCTVP).

STONE → ENOTS → GPQVU → PQVUG.

Solution

The letters are swapped in pairs: SI LV ER → IS VL RE.

So POCKET → OPKCTE.

Solution

Reverse the word and move each letter 2 places forward: EAGLE → ELGAE → GNICG.

CANDLE → ELDNAC → GNFPCE.

Solution

Each letter always gets the same digit: S = 1, P = 3, I = 8, A = 9, C = 2.

So SPIAC = 13892.