Coding and Decoding Questions

If 12 (20) 16 and 21 (35) 28, then what is value of A in 48 (80) A ?

In a code language, BURN is written as YFIM. What is the code for WOUND?

In a certain code language, '+' represents 'x', '-' represents '+', 'x' represents '÷' and '÷' represents '-'. What is the answer to the following question?

50 + 3 ÷ 125 x 5 - 25 = ?

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

If 9@3=12; 15@4=22; 16@14=4; then what is the value of 6@2=?

In the following question, which one set of letters when sequentially placed at the gaps in the given letter series shall complete it?

X_ZX_YY_ZX_Z

If in a certain code, GREEN is written as ITGGP, then how will OINK be written as in the same code?

If '+' means '÷', '÷' means '­', '­' means 'X' and 'X' means '+', then 48 + 16 x 4 ­2 ÷ 8 = ?