What will come in the place of the question mark (?) in the following equation, if ‘+’ and ‘−’ are interchanged and ‘×’ and ‘÷’ are interchanged?
(84 × 12) ÷ 4 - (72 × 9) ÷ 3 + 15 = ?

Given: (84 × 12) ÷ 4 - (72 × 9) ÷ 3 + 15 = ?

Using BODMAS rule.

​$$\begin{array}{|c|c|} \hline\textbf{Operation preference wise} & \textbf{Symbol} \\\hline\text{Brackets} &[],{}, () \\ \hline \text{Orders, of} & (power), √ (root) , of \\ \hline \text{Division}& ÷ \\ \hline \text{Multiplication} & × \\ \hline \text{Addition} & + \\ \hline \text{Subtraction} & - \\\hline\end{array}$$

New equation: (84 ÷ 12) × 4 + (72 ÷ 9) × 3 - 15 = ?

7 × 4 + 8 × 3 - 15 = ?

28 + 24 - 15 = ?

52 - 15 = ?

? = 37

Thus, correct option is (d).