Coding Decoding

This is the correct option. The pattern followed is A = 1, B = 2, C = 3...H = 8 and so on. Thus, H(8) + A(1) + R(18) + D(4) = 31. Thus, L(12) + O(15) + F(6) + T(20) = 53.

This is the correct option. The pattern followed here is that the position at which the letter occurs is divided by 2.
Thus, F is 6/2 = 3, H is 8/2 = 4 and so on. Thus, D(4) + R(18) + U(21) + M(13) = 4 + 18 + 21 + 13 = 56/2 = 28.
Then, J(10) + U(21) + G(7) = 10 + 21 + 7 = 38/2 = 19.

This is the correct option. The pattern followed here is that the value of C = 4, D = 5, E = 6 and so on. The value of D(5) + O(16) + L(13) + L(13) = 47. Thus, the value of L(13) + E(6) + F(7) + T(21) = 47

This is the correct option. The pattern followed here is X = 3, W = 4, V = 5, U = 6 and so on. Thus, C(24) + O(12) + D(23) + E(22) = 24 + 12 + 23 + 22 = 81 and D(23) + U(6) + K(16) + E(22) = 67.

This is the correct option. The pattern followed here is that each letter in the word is moved one step forward to obtain the corresponding letter of the code.
Thus, 'A' moves to 'B', 'B' to 'C' and so on.

This is the correct option. The pattern followed here is that the letters of the word are written in a reverse order to obtain the code.
So, MARRIAGE is written as EGAIRRAM and SUPER is written as REPUS.

This is the correct option. The pattern followed here is that the word is first written twice and the letters at the even positions in the word are so obtained. Thus, ABROGATE is written as ABROGATEABROGATE and letters at even positions are BOAEBOAE and at ADAMANTADAMANT are DMNAAAT.

This is the correct option. The first, third and fifth letters of the word are each moved one step backwards, while the second, fourth and sixth letters are respectively moved one, two and three steps forward. Thus, EXTANT is written DYSCMW and CAVORT as BBUQQW.

This is the correct option. The pattern followed here is that each letter of the word is moved four steps backwards to obtain the code. Thus, 'F' moves four steps backwards to 'B', 'E' to 'A' and so on.

This is the correct option. The place of the first two letters and the last two letters of the word are interchanged, while the third, fourth, fifth and sixth letters are each moved one step forward. So, 'DI' was interchanged to 'ID' and 'IC' was interchanged to 'CI' and D, A, C, T moved to E, B, D, U.

The letters are coded as follows

So, in HINDU, H is coded as 5, I as 6, N as 7, D as 4 and U as 3. So, HINDU is coded as 56743.
 

The given letters are coded as

Thus, L is coded as 5, A is coded as 1, B as 7, E as 2 and L as 5.

The letters in the given words are coded as

Thus, T is coded as 7, I as 8, L as 3, E as 2 and S as 6.

Here, the numbers are coded as

Here, 8 is coded as P, 4 as A, 5 as S, 3 as T and 6 as E.

Here, the numbers are coded as

Thus, 3 is coded as T, 8 as O, 9 as R, 6 as S and 8 as O.