Coding-Decoding

There are two types of problems asked based on coding-decoding. Those problems are based on:
1.    Letter Coding-decoding
2.    Number Coding-decoding

1.    Letter Coding-decoding:
Basic information about the arrangements of English letters is require to deal with such problems. Here I’m listing some of the basics about the arrangements of alphabets in English language.
·         There are 26 alphabets in English out of which 5(A,E,I,O,U) are called vowels and remaining 21 are called consonants.
·         Numbers assigned to these letters in forward and reverse order are as follows:

A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
11
8
7
6
5
4
3
2
1

A-------------------Z
<<<<LEFT           RIGHT>>>>

Example: CEMENT is EGOGPV then FLOOR would be?
Explanation:

                             C E M E N T                 E G O G P V
                                                        C+2=E
                                                        E+2=G
                                                        M+2=O
                                                        E+2=G
                                                        N+2=O
                                                         T+2=V
 


By the same logic          F L O O R                   H N Q Q T



2.    Number Coding-decoding:
Most of the questions ask in this category is based on the place value of the letter(mention in above table).
Let us take an example to understand
Example: APPLE is codded as 50 then what would be the code for ORANGE
Explanation:
                        Place value of letter A=1 (from the above table)
                        Place value of letter P=16
                        Place value of letter P=16
                        Place value of letter L=12
                        Place value of letter E=5
                                      Sum=1+16+16+12+5=50

                        Similerly by adding the place value of letters in ORANGE, we get                                                                                             
                                                       15+18+1+14+7+5=60 
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