Coding and Decoding Questions

If 11$25 = 18, 12$20 = 16 then what is the value of 4$50 = ?

If "P" denotes "multiplied by", "R" denotes "subtracted from", "S" denotes "added to" and "Q" denotes "divided by", then 6 P 7 S 169 Q 13 R 5 = ?

In a certain code language, 'x' represents '+', '÷' represents 'x', '-' represents '÷' and '+' represents '-'. Find out the answer to the following question.

17 x 18 ÷ 30 - 20 + 14 = ?

In a certain code language, “RINKS” is written as “SKOMT”. How is “FRIED” written in that code language?

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

In a code language, FATE is written as 61205. What is the code for LEAN?

If REDUCE= 56, RECYCLE = 71 then REUSE=?

If MARBLES is coded as PDUEOHV, then how will GIN be coded as?