​If '÷' means '+', '–' means '×', '×' means '–' and '+' means '÷', then find the value of

40 ÷ 20 × 10 + 10 – 5.​

Given:  40 ÷ 20 × 10 + 10 – 5 

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

Substitute the given operators with their new meanings

So, rewriting the expression:

40÷20×10+10-5

Becomes:

40+20-10÷10×5

40 + 20- 1 × 5

40 + 20- 5

60 - 5 

55

Thus, the Correct Option is (a) 55.