Coding and Decoding Questions

In a certain code language, '+' represents 'x', '-' represents '+', 'x' represents '÷' and '÷' represents '-'. What is the answer to the following question?

54 x 9 - 3 ÷ 4 = ?

In a certain code language, if SIGN is coded as 8367 and DIRECT is coded as 134259, then SIREN will be coded as

In a certain code language "POUCH" is written as "53461", and "PRAYERS" is written as "578902⇑". How will "CHEES" be written in that code language?

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

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

If 75$26 = 4, 69$53 = 7 then what is the value of 82$46 = ?

If DIJOB means CHINA, then the last letter of the word got by decoding KBQBO is

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 = ?