Coding and Decoding Questions

If "+" means "minus", "x" means "divided by", "÷" means "plus" and "­" means "multiplied by", then 240 x 12 – 6 + 29 ÷ 42 = ?

If 10$25 = 8, 12$25 = 10 then what is the value of 14$53 = ?

In a certain code language, " EXCITED" is written as "DETICXE". How is "KINLEY" written in that code language?

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

56 ÷ 8 + 12 - 72 = ?

If 8*2 = 3, 14*18 = -2 and 18*2 = 8, then find the value of 14*10 = ?

In a certain code language, '+' represents 'x', '-' represents '+', 'x' represents '÷' and '÷' represents '-'. What is the answer to the following question?
550 x 22 - 24 + 3 = ?

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

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.

8 x 5 x 0 = 805 , 7 x 4 x 6 = 764 , 6 x 8 x 9 = ?