Coding and Decoding

Letter, number and symbol coding-decoding.

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Q1 · Coding and Decoding · EASY
In a certain code language, 'BOOK' is written as 'CPPL'. How is 'PAGE' written in that code?
Q2 · Coding and Decoding · EASY
If in a certain code, 'TRAIN' is coded as '27418' and 'METRO' is coded as '35269', what is the code for 'RAIN'?
Q3 · Coding and Decoding · MEDIUM
In a code language, if 'DELHI' is written as 'EFMIJ', 'MUMBAI' is written as 'NVNCBJ', then how is 'INDIA' written in that code?
Q4 · Coding and Decoding · MEDIUM
In a certain code, 'CAT' is coded as '24', 'DOG' is coded as '26', and 'RAT' is coded as '39'. What is the code for 'BAT'?
Q5 · Coding and Decoding · HARD
In a certain code, 'PAPER' is written as 'OZODQ'. Using the same coding pattern, if a word is coded as 'SDQFK', what is the original word?