Coding and Decoding Questions

If "#" means "subtraction", "&" means "division", "@" means "addition" and "%" means "multiplication", then 315&3#9@4%6 = ?

If a = x, b = / and c = +, find the value of 7a5c1b6

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

In a certain code language, 'x' represents '+', '÷' represents 'x', '-' represents '÷' and '+' represents '-'. Find out the answer to the following question.
 
15 x 4 ÷ 35 - 70 + 16 = ?

If 8 θ 12 δ 6 = 60 and 13 θ 15 δ 11 = 74, then 18 θ 21 δ 15 = ?

If MACHINE is coded as 19-7-9-14-15-20-11, how will you code DANGER?

If WORK = 7935, ROCK = 3587 and WART = 1945, which digit stands for T?

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 = ?