Coding and Decoding Questions

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

18 - 2 + 20 x 10 ÷ 4 = ?

In a certain code, 327 means 'don't cut tree', 635 means 'plant one tree', 138 means 'tree gives shade' and 4953 means 'we must plant tree'. Which digit represents 'shade'?

 In a certain code language, “POLIS” is written as “SROLV”. How is “MRUGS” written in that code language?

If in a certain code language, PROMOTION is written as 365458957, how will the word MONITOR be written in that code language?

In a certain code language, “TURTLE” is written as “RRNRIA”. How is “LOYALS” written in that code language?

In a certain code language, “MOTOR” is written as “ORXTX”. How is “GUARD” written in that code language?

If P denotes '÷', Q denotes 'x', R denotes '+' and S denotes '­', then 18Q12P4R5S6 = ?

If 'due to you' is coded as 'ba da ca', 'he is due' as 'xe ba le' and 'is sue to' as 'ba xe ca', then 'you' = ?