Solve the following expression.
50-[20+(30-(25-5)]

50-[20+(30-(25-5)] 

Concept Used: ​

BODMAS rule;

​$$\begin{array}{|c|c|} \hline \bf \text{Operation preference wise} & \text{Symbol} \\ \hline Brackets &[],{}, () \\ \hline Orders, of & ² (power), √ (root) , of \\ \hline Division & ÷ \\ \hline Multiplication & × \\ \hline Addition & + \\ \hline Subtraction & - \\ \hline \end{array}$$  

50 – [20+(30 – (25 – 5))]
= 50 – [20 + (30 – 20)]
= 50 – [20 + 10]
= 50 – 30
= 20 ​​