Coding and Decoding Questions

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

825 x 25 - 27 ÷ 10 = ?

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

If 'whom' means 'x', 'she' means '/', 'will' means '+' and 'come' means '-', then what will the value of ' 8 when 12 will 16 she 2 come 10'?

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

If DRIVER is coded as 5 and BELIEVED is coded as 7, then what is the code for EXAMINATION?

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

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