Coding and Decoding Questions

In a certain code language, "MASTER" is written as "682145" and "STAMP" is written as "21869". How is "PASTE" written in that code language?

In a certain code language, "RAINBOW" is written as "1987645" and "SNAP" is written as "3790". How is "PIANO" written in that code language?

In a certain code language, "NIGHT" is written as "ODDGM" and "DARK" is written as "GOYC". How is "GREEN" written in that code language?

In a certain code language, "MATERIAL" is written as "RIALMATE". How is "REMEMBER" written in that code language?

If ENCRYPT is coded as VMXIBKG, then how will ARC be coded as?

Which of the following interchanges in signs will make the given equation correct?
17- 15 x 5 = 250

If 17@1=8; 9@1=4; 6@4=1; then what is the value of 8@2=?

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

2 - 12 + 10 x 5 ÷ 12 = ?