Coding and Decoding Questions

If 23@5=56; 6@7=26; 5@2=14; then what is the value of 7@5=?

In a certain code language, "NATURE" is written as "TANURE". How is "LISTEN" written in that code language?

If SUN = 108, MOON = 114. What is STAR = ?

If C is coded 3 , DASH is coded as 32 , then DANCE will be coded as

If "A" denotes "multiplied by", "B" denotes "subtracted from", "C" denotes "added to" and "D" denotes "divided by", then

8 B 31 C 49 D 7 A 16 = ?

In a certain code language, "RUMOUR" is written as "MURRUO". How is "RACKET" written in that code language?

If "α" denotes "subtracted from", "β" denotes "multiplied by", "θ" denotes "added to" and "δ" denotes "divided by", then 10 θ 8 β 4 δ 8 α 9 = ?

If "A" means "plus", "B" means "divide", "C" means "multiply" and "D" means "minus", then 187 B 17 C 4 A 7 D 17 = ?