Coding and Decoding Questions

If DECEMBER is coded as EDECBMRE then FEBRUARY will be coded as

If "A" denotes "added to", "B" denotes "divided by", "C" denotes "multiplied by" and "D" denotes "subtracted from", then 116 B 29 C 6 A 24 D 45 = ?

If RATION is written as OXQFLK then LUMBER may be written as _____ .

In a certain code language, "TREASON" is written as "RKWWINX" and "POULTRY" is written as "CNXHYKT". How is "NUMBER" written in that code language?

If "+" means "minus", "x" means "divided by", "÷" means "plus" and "-" means "multiplied by", then
300 x 10 – 5 + 36 ÷ 57 = ?

If L denotes 'x', M denotes '÷' , P denotes '+' and Q denotes '-'  then 16P24M8Q6M2L3

If FRIEND is coded as HTKGPF then REVEAL will be coded as:

If FLOTSAM is coded as UOLGHZN, then how will PIN be coded as?