Coding and Decoding Questions

In a certain language KINDLE is coded as ELDNIK, how is IMPOSING coded in that code?

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, '+' represents 'x', '-' represents '+', 'x' represents '÷' and '÷' represents '-'. What is the answer to the following question?

825 x 25 - 27 ÷ 10 = ?

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

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

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

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

42 x 7 ÷ 7 + 9 - 62 = ?

 In a certain code language, “MAKERS” is written as “KAMSRE” and “SINGER” is written as “NISREG”. How is “TRADER” written in that code language?