Coding and Decoding Questions

If CHANTED is coded as ZEXKQBA, then how will MAY be coded as?

In a certain code, if DOG is written as 4157, then what will MAT be written as ?

In the following question, by using which mathematical operators will the expression become correct?
27 ? 9 ? 18 ? 24 ? 12

If '÷' stands for subtraction,'-' stands for addition,'x' stands for division and '+' stands for multiplication, then which one of the following equation is correct?

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

80 x 16 ÷ 4 + 2 - 8 = ?

In a certain code language, “TALCS” is written as “UENCV”. How is “SPARK” written in that code language?

Identify the correct combination of mathematical signs to replace "*" sign in the given equation and balance the equation.

14*6*3*5*4*20

In a certain code language, “MAKER” is written as “PDNHU”. How is “TOOLS” written in that code language?