Simplify:
186-7× (63-39)+25÷5

Correct option is B

Concept used:
​$$\begin{array}{|c|c|} \hline \textbf{Operation preference wise} & \textbf{Symbol} \\ \hline Brackets &[],{}, () \\ \hline Orders, of & ² (power), √ (root) , of \\ \hline Division & ÷ \\ \hline Multiplication & × \\ \hline Addition & + \\ \hline Subtraction & - \\ \hline \end{array}$$​​
Solution:
186-7× (63-39)+25÷5
= 186−7×24+25÷5
= 186−168+5
= 18+5
= 23