Simplify the following:
21- 4.9 ÷ 7 + 3.9 × 0.4 + 0.9

Correct option is D

Given:

​21- 4.9 ÷ 7 + 3.9 × 0.4 + 0.9

Concept Used:

BODMAS rule:

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

Solution:

​21- 4.9 ÷ 7 + 3.9 × 0.4 + 0.9

= 21 - 0.7 + 3.9 $$\times$$​ 0.4 + 0.9

= 21 - 0.7 + 1.56 + 0.9

= 23.46 - 0.7

= 22.76