Which one is not a clay

If ‘P’ means (÷), ‘Q’ means (×), ‘R’ means (+), and ‘S’ means (-), then what is the value of the expression:

Which two signs should be interchanged to make the below equation mathematically correct?

9 ÷ 3 + 6 – 6 × 2 = 30

If ‘$’ means ‘+’, ‘#’ means ‘-’, ‘*’ means ‘×’ and ‘@’ means ‘÷’, then what is the value of the given expression?

What will be the value of expression if the numbers/digits ‘(20)’ and ‘(50)’ are interchanged?

20 - 32 ÷ 4 × 5 + 15 + 50

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

45 $ 5 $ 68 $ 17$ 12 = 37

If '+' means '-', ' X ' means '+', '-' means '÷' and '÷' means ' X ', then what is the value of the following expression?