Coding and Decoding Questions

In a certain code language, “FRIED” is written as “EQHDC”. How is “RUSTY” written in that code language?

If 6 * 9 – 4 = 58 and 3 * 9 – 7 = 34, then in the expression A * 4 – 9 = 91, what is the value of 'A'?

If "x" denotes "added to", "÷" denotes "subtracted from", "+" denotes "divided by" and "–" denotes "multiplied by", then 14 x 12 – 16 ÷ 18 = ?

In a certain code language, "TREASON" is written as "RKWWINX" and "POULTRY" is written as "CNXHYKT". How is "NUMBER" written in that code language?

If 15@7=44; 5@4=18; 6@17=46; then what is the value of 17@4=?

If 4 * 2 = 3 and 8 * 4 = 3 , then 21 * 7 = ?

If '­' means 'x' , 'x' means '+' , '+' means '÷' and '÷' means '­' , then what will be the value of 40 x 12 + 3 ­ 6 ÷ 60 = ?

In a certain code language, “CUDGEL” is written as “FYGKHP”. How is “DAINTY” written in that code language?