Coding and Decoding Questions

If 80&10 = -8, 50&2 = -25 and 80&16 = -5, then find the value of 20&5 = ?

If 9*4 = 26, 4*4 = 16 and 3*6 = 18, then find the value of 5*2 = ?

If 'WZB' stands for 'DAY', how will you code 'MONDAY'?

In a certain code language, "DURING" is written as "GRUFQD". How is "PICKED" written in that code language?

If "S" denotes "multiplied by", "P" denotes "subtracted from", "R" denotes "added to" and "Q" denotes "divided by", then 14641 Q 121 P 100 S 2 R 100 = ?

If the code for MOTHER is JRQKBU then what is the code for PRINCIPAL?

If 19 $ 7 = 312 and 23 $ 9 = 448, then 31 $ 11 = ?

In this question, some equations are solved on the basis of a certain system. On the same basis find out the correct answer from amongst the four alternatives for the unsolved equation.

6 x 2 x 9 = 269

8 x 7 x 1 = 781

4 x 1 x 3 = ?