Which of the following substances is used to disinfect

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

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

28 * 174 * 6 * 4 * 126 = 18

If '+' means 'divided by', '-' means 'add', ' X ' means 'minus' and '÷' means 'multiplied by'. What will be the value of the following expression?

Which among the given operators should replace the “%” (in the same order) in the given expression below:

6 % 11 % 6 % 37 % 30 % 7

After interchanging "×" and "÷", "7" and "4", which of the following equations becomes correct?

If '+' means 'x', '-' means '÷', 'x' means '+' and '÷' means '-', what will come in place of the question mark (?)?

12 + ? - 6 x 20 ÷ 5 = 55

If 14 (16) 8 and 28 (20) 5, then what is the value of A in 63 (A) 4?

Statements:

V ≤ P < S = B; T < U ≤ I = B; N < J < T

Conclusions:

I. J > P

II. N < S

Select the correct combination of mathematical signs that can sequentially replace the ‘*’ signs and balance the given equation.