What will come in place of the question mark (?) in the following equation if ‘+’ and ‘÷’ are interchanged and also ‘×’ and ‘–’ are interchanged?
42 + 7 ÷ 24 × 6 – 3 = ?

​42 + 7 ÷ 24 × 6 – 3 = ?

Bodmas rule

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

The equation is:

42 + 7 ÷ 24 × 6 – 3 = ?

Interchange the operations:

‘+’ and ‘÷’ are interchanged.
‘×’ and ‘–’ are interchanged.

equation becomes:

= 42÷7+24−6×3

= 6+24−6×3

= 6+24−18

= 30−18

Thus, correct option is (b).