Which communication model involves feedback from the

If A $ B means A X B, A € B means A ÷ B, A & B means A + B and A @ B means A - B, then what is the value of '178 & 100 € 25 @ 18 $ 4 & 22'?

If + denotes ÷, × denotes -, - denotes ×, and ÷ denotes +, what is the value of the following expression:

124 + 4 × 5 – 6 ÷ 6 + 3 = ?

Which two signs need to be interchanged to make the following equation correct?

56 – 12 × 60 ÷ 12 + 30 = 92

Select the correct sequence of mathematical signs to replace the ‘@’ signs so as to balance the given equation.

252 @ 28 @ 11 @ 5 @ 22 = 42

If ‘%’ means (÷), ‘#’ means (-), ‘@’ means (×), and ‘&’ means (+), then what is the value of the expression:

After interchanging the given two signs and two numbers, what will be the value of the following expression?

÷ and +; 6 and 25

Which sequence of mathematical symbols among given sequences must be inserted in place of the (?) in order to obtain the desired result?

If ‘A’ means (÷), ‘B’ means (×), ‘C’ means (+), and ‘D’ means (-), then what is the value of the expression:

Select the correct combination of mathematical signs that can sequentially replace the * signs and make the equation correct.

45 $ 5 $ 68 $ 17$ 12 = 37