Coding and Decoding Questions

If 6#30=5; 8#24=3; 7#28=4; then what is the value of 8#40=?

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.

7 x 5 x 6 = 576,
4 x 2 x 5 = 245,
8 x 2 x 5 = ?

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.

3X4X5 = 435
4X3X2 = 342
2X3X4= ?

If 70$7 = -10, 50$5 = -10 and 40$8 = -5, then find the value of 10$2 = ?

If 15#2 = 26, 11#3 = 16 and 10#9 = 2, then find the value of 11#4 = ?

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

If 4!4 = 80, 3!8 = 110 and 6!2 = 80, then find the value of 7!9 = ?

If 8 θ 12 δ 6 = 60 and 13 θ 15 δ 11 = 74, then 18 θ 21 δ 15 = ?