Coding and Decoding Questions

If P denotes ÷ , Q denotes x, R denotes + and S denotes ­ then what is the value of 18Q12P4R5S6

In a code language, if LUCK is written as L2U1C3K1, then what is the last digit for the code for XEROX in that same language?

If 35 % 31 = 12, 92 % 30 = 14 then what is the value of 15 % 24 = ?

In a certain code, if LEMON is coded as PWOMA then SHIRT is coded as

If BOULDER is coded as ZMSJBCP, then how will ELK be coded as?

If STUDENT is coded as 103, what is the code for SCHOOL?

In a certain code language, "REMINDER" is written as "SFNJMCDQ". How is "STANDARD" written in that code language?

In these questions, the relationship between two elements is shown in the statements. These statements are followed by two conclusions.
Statement:
Y > A < N, Y = B <P
Conclusion:
I. P > A
II. N > B