Coding-Decoding Questions and Answers

Answer: A

The code for Student is $.

'Intelligent Bright Student' is # @ $ and 'Student Is Bright' is $ % @. The words common to both are Bright and Student, and the common symbols are @ and $. From 'Bright Star Sun' = @ * ?, Bright is @. So Student is $, Intelligent is #, and Is is %.

? belongs to Star or Sun, @ is Bright, and # is Intelligent.

Answer: B

The code for Bright Star is @*.

Bright is @ (see the working above). 'Bright Star Sun' is @ * ?, so Star is either * or ?; the data do not say which. Of the options, only @* combines @ with one of those two symbols, so it is the only possible answer.

@# pairs Bright with Intelligent, ?% uses the code for Is, and #@ is Intelligent Bright.

Answer: D

The word written as % is Is.

'Student Is Bright' is $ % @. Student is $ and Bright is @, so the remaining word, Is, is %.

Bright is @, and Sun and Star share * and ?, which do not appear in the code containing %.

Answer: A

Correct answer: ROAAKNM

The letters in even positions are written first, then those in odd positions. MADRAS gives A, R, S from positions two, four and six, followed by M, D, A from positions one, three and five - that is ARSMDA. ARKONAM has seven letters, so the even positions give R, O, A and the odd positions give A, K, N, M, making ROAAKNM.

Answer: D

Correct answer: EOJDJEFM

Reverse the word, then advance every letter by one except the first and the last. COMPUTER reversed is RETUPMOC, and keeping the R and the C while advancing the six between them gives RFUVQNPC. MEDICINE reversed is ENICIDEM; keeping the E and the M and advancing N, I, C, I, D and E gives EOJDJEFM.

Answer: C

Correct answer: PELBORM

The first and last letters stay where they are and everything between them is reversed. FASHION keeps F and N, and ASHIO reversed is OIHSA, giving FOIHSAN. PROBLEM keeps P and M, and ROBLE reversed is ELBOR, so the code is PELBORM.

Answer: C

Correct answer: MNUMNUMNU

Every third letter is taken and the result written three times. BOMBAY has six letters, so the third and sixth - M and Y - give MY, written as MYMYMY. TAMILNADU has nine, so the third, sixth and ninth are M, N and U, and the code is MNUMNUMNU.

Answer: A

Correct answer: BGYEPYK

Both examples use the same rule, a shift of two places back: MIND gives KGLB and ARGUE gives YPESC, the A wrapping round to Y. DIAGRAM therefore gives D→B, I→G, A→Y, G→E, R→P, A→Y, M→K, that is BGYEPYK. The two A’s must both become Y, which settles the answer between the first two options.

Answer: C

Correct answer: HCKVJHWN

Each letter advances two places: TRUTHFUL gives VTWVJHWN. FAITHFUL under the same shift gives F→H, A→C, I→K, T→V, H→J, F→H, U→W, L→N, that is HCKVJHWN. Both words end in the same four letters, so the last four of the code must match those of the example - a useful check.

Answer: B

Correct answer: FKOALD

Every letter moves four places back, as GEORGE to CAKNCA shows. JOSEPH therefore gives J→F, O→K, S→O, E→A, P→L, H→D, that is FKOALD. The wrong options have the right letters in the wrong order, so working through the word in sequence rather than matching letters is what settles it.