What will come in the place of '?' in the following equation, if ‘+’ and ‘-’ are interchanged and also ‘×’ and ‘÷’ are interchanged?
15 ÷ 27 × 3 + 36 – 12 = ?
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Given:  ‘+’ and ‘-’ are interchanged and also ‘×’ and ‘÷’ are interchanged. 

Logic: interchange mathematical operators and solve as per BODMAS rule.

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

15 ÷ 27 × 3 + 36 – 12

After interchanging,

=15 × 27 ÷ 3 - 36 + 12

=15 ×9 – 24

=135-24