Coding and Decoding Questions

If 7∆6 = 84, 1∆4 = 8 and 2∆3 = 12, then find the value of 8∆4 = ?

If 9&4 = 50, 3&7 = -40 and 7&5 = 20, then find the value of 4&5 = ?

If the mathematical operator, '+' means 'x', '/' means '-', '-' means '+', and 'x' means '/', then the value of 11 +14 x7- 5 / 29 is

 If 3@7 = 20, 8@1 = 18 and 6@5 = 22, then find the value of 4@4 = ?

If 2%1 = 30, 6%2 = 80 and 2%5 = 70, then find the value of 4%1 = ?

The following equation is incorrect. Which two signs should be interchanged to correct the equation?

20 + 12 x 35 - 20 ÷ 10 = 31

If 20#4 = -5, 50#25 = -2 and 80#16 = -5, then find the value of 10#2 = ?

If the mathematical operators, 'x' means '+', '/' means 'x', '+' means '-', and '-' means '/', then 22 + 36 - 12 x 6 / 4 = ?