Coding and Decoding Questions

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

If 9@7=4; 6@1=10; 7@4=6; then what is the value of 8@2=?

If 70*10 = -7, 50*5 = -10 and 10*5 = -2, then find the value of 80*1 = ?

If PONDERS is coded as ONCDQR, then how will MAT be coded as?

If MARBLES is coded as PDUEOHV, then how will GIN be coded as?

If A = 1, E = 5, then HEAR = ?

If in a certain language TEACHER is coded as QBXZEBO, then how is STUDENT coded in the same language?

If 2*10 = 6, 14*16 = 15 and 4*16 = 10, then find the value of 16*8 = ?