Coding and Decoding Questions

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

If 18 x 12 = 206 and 19 x 22 = 408, then 23 x 36 = ?

If A denotes '+', B denotes '­', C denotes 'x' and D denotes '÷', then which of the following statement is true?

In a certain code language, "READ" is written as "18514". How is "RATE" written in that code language?

In a certain code GIVE is written as VIEG and OVER is written as EVRO. How will DISK be written in that code?

In a certain code language, "TEACHER" is written as "6427341" and "MAN" is written as "825". How is "MERCHANT" written in that code language ?

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

If 3*1 = 20, 6*1 = 50 and 2*6 = -40, then find the value of 5*8 = ?