# 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