Coding and Decoding Questions

If 3 @ 3 * 3 = 3 and 48 @ 4 * 3 = 36, then 91 @ 13 * 2 = ?

In a certain code language, "CAUGHT" is written as "125679" and "HEN" is written as "740". How is "TAUGHT" written in that code language?

In a certain code language, "PAGE" is written as "QCJI". How is "CALL"written in that code language?

If "A" denotes "multiplied by", "B" denotes "subtracted from", "C" denotes "added to" and "D" denotes "divided by", then

7 B 17 C 88 D 11 A 6 = ?

If 5 * 3 = 19 and 8 * 5 = 49, then what should 6 * 4 be?

In a certain code language, "MOTHER" is written as "NPUGDQ". How is "ORANGE" written in that code language ?

In a certain language "BROTHER" is written as "CSPUIFS". How is "SISTER" written in that code language?

In a certain code language,"MASTER" is written as "RETSAM". How is "LITERACY" written in that code language?