Coding and Decoding Questions

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

15 x 2 + 10 - 8 ÷ 20 = 15

If 7Ω6 = 84, 8Ω7 = 112 and 8Ω4 = 64, then find the value of 3Ω4 = ?

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

12 ÷ 4 - 15 x 10 + 2 = 8

If

4x9=25
7x4=53

then

9x4=?

In a certain code, TRIPPLE is written as SQHOOKD. How is EXOTIC coded in that code?

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

1 ÷ 14 x 30 + 20 - 10 = 12

If "$" means "added to", "@" means "divided by", "#" means "multiplied by" and "%" means "subtracted from", then

136 @ 17 # 0 $ 19 % 5 = ?

If + means x, - means /, x means + and / means -; compute the value of the expression

36 - 4 + 7 x 8