Coding and Decoding Questions

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

18 + 2 x 30 ÷ 6 - 4 = ?

In a certain code language, “FRAK” is written as “35” and “MALT” is written as “45”. How is “TRIM” written in that code language?

In a certain code, RIPPLE is written as 613382, PREACH is coded as 362457. How is PILLER written in that code?

If "-" means "plus", "x" means "divided by", "÷" means "multiply" and "+" means "substraction", then

If BOULDER is coded as ZMSJBCP, then how will ELK be coded as?

If in a certain language, TREE is coded as USFF, how is MANGO coded in that language?

In a certain code language, “MATE” is written as “41” and “LION” is written as “52”. How is “TARM” written in that code language?

If "S" denotes "multiplied by", "V" denotes "subtracted from","M" denotes "added to" and "L" denotes "divided by", then

44 L 11 S 7 V 7 M 9 = ?