Olympiad Test: Coding Decoding - 2 - Class 7 MCQ

The letters of the word are written in a reverse order and on the group of letters so obtained, the first, third and fifth letters are each moved one step forward while the second and fourth letters are each moved one step backward to get the code. 

SHOULDER ⟶ SHOU/LDER ⟶
REDL/SHOU ⟶ ODCK/TIPV.

The first, second, third, fourth and fifth letters in the word are respectively one, two, three, four and five steps ahead of the corresponding letter of the code.

The word is divided into groups of two letters and first word is divided into one group.

The order of letters of the word is reversed in the code. So, reverse the order of the letters in the code to get the word.

Substituting the letters of the given word with their respective codes.

Letter M I N E R A L S O U D
Code Q R S T U V W A B C D
The code for READER is UTVDTU.

Letter T E A C H R
Code L M K J N P
The code for HEART is NMKPL.

Substituting the letters of the given word with their respective codes,

Letter P O R T E
Code M B N Z Q
The code for REPORT is NQMBNZ.

Letter R A S C L
Code B N M Z T
The code for SALSA is MNTMN.

Letter F A C T O R I L D N E
Code D O D N G L C H Y J Z
The code for EDUCATION is ZJDONCGJ.

Letter SH E P B L A T
Code GA X R H P T N
The code for SLATE is GPTNX.

Letter S T A R K M O B I L E
Code L B F M G T N R S P J
The code for BLAME is RPFTJ.

SUN = S + U + N = 8 + 6 + 13 = 27
CAT = C + A + T = 24 + 26 + 7 = 57

A = 1, B = 2, …… T = 20, …… , Z = 26.
AT = A×T = 1 × 20 = 20; BAT = B × A × T 
= 2 × 1 × 20 = 40
CAT = C × A × T = 3 × 1 × 20 = 60

A = 2, B = 3, ……, Z = 27.
FOR = F + O + R = 7 + 16 + 19 = 42
FRONT
= F + R + O + N + T 
= 7 + 19 + 16 + 15 + 21 = 78