Coding and Decoding Questions

In a certain code language, "COPIOUS" is written as "2345389" and "GENEROUS" is written as "16760389". How is "PIGEON" written in that code language?

If "+" means "minus", "x" means "divided by", "÷" means "plus" and "-" means "multiplied by", then
76 x 4 + 4 – 12 ÷ 37 = ?

In a certain code language, "OPTIMIST" is written as "LKRNRGHG". How is "PESSIMIST" written in that code language?

If 35 % 31 = 12, 92 % 30 = 14 then what is the value of 15 % 24 = ?

If UNCOVER is coded as FMXLEVI, then how will TIP be coded as?

If QUICKLY is coded as OSGAIJW, then how will HUE be coded as?

In a certain code, if LEMON is coded as PWOMA then SHIRT is coded as

In a code language, AILMENT is written as 1923540. What is the code for DISEASE?