If '+' and '÷' are interchanged, and '–' and 'x' are interchanged, what will come in place of the question mark (?) in the following equation?
21 ÷ 57 – 3 × 8 + 4 = ?

Correct option is B

Given : 21 ÷ 57 – 3 × 8 + 4 = ?

Logic: BODMAS
​$$\begin{array}{|c|c|} \hline\textbf{Operation preference wise} & \textbf{Symbol} \\\hline\text{Brackets} &[],{}, () \\ \hline \text{Orders, of} & (power), √ (root) , of \\ \hline \text{Division}& ÷ \\ \hline \text{Multiplication} & × \\ \hline \text{Addition} & + \\ \hline \text{Subtraction} & - \\\hline\end{array}$$​​
New Equation: 21 + 57 ​×  3 - 8 ​÷ 4 = ?
21 + 57 × 3 - 2 = ?
21 + 171 - 2 = ?
192 - 2 = ?
? = 190
Thus, the correct option is  (B) 190  ​