If ‘’ + means ‘-’, ‘-’ means ב’, ב’ means ‘÷’, ÷‘’ means ‘+’, what will come in place of the question mark (?) in the following equation? 

Equation: 25×5÷7-10×2=?

Given Equation: 25×5÷7-10×2=?

New Equation;

now solve according to BODMAS 

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

= 25÷5+7×10÷2

= 5+7×5

= 5+35

= 40
Thus, the correct answer is (d) 40.​​