Coding and Decoding Questions

In a certain code language, "CERTAIN" is written as "DFSTBJO". How is "CRICKET" written in that code language?

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 BROTHER is coded as GWTYMJW, then SCHOOL is coded as

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

If CROWNED is coded as APMULCB, then how will TAP be coded as?

If "#" means "subtraction", "&" means "division", "@" means "addition" and "%" means "multiplication", then 217 & 7 # 3 @ 2 % 7 = ?

In a certain code language, “MAYOR” is written as “NBZPS”. How is “PLAYER” written in that code language?

If 5@1=60; 12@8=200; 16@2=180; then what is the value of 16@10=?