Coding and Decoding Questions

In a certain code language, "NUMBER" is written as "156897" and "BARREN" is written as "847791". How is "RUBBER" written in that code language?

In a certain code language, “PRIME” is written as “VNRIK”. How is “MICRO” written in that code language?

In a certain code language, "HISTORY" is written as "XQNSRHI". How is "ETHICS" written in that code language?

If in a certain code TEACHER is written as VGCEJGT, how would STUDENT be written in the same code?

In a certain code language, "KINGFISHER" is written as "+$@*!$><^?". How is "NEIGH" written in that code language?

If 13∆3 = 20, 12∆7 = 10 and 12∆5 = 14 then find the value of 16∆2?

In a certain code language, "MOBILE" is written as "OQDKNG". How is "RANGER" written in that code language?

If E=5, PEN=35, then PAGE=?