do the inner most parentheses first
$${\mathtt{30}}{\mathtt{\,\small\textbf+\,}}{\mathtt{35}} = {\mathtt{65}}$$
then add everything in the outer more parentheses together
$${\mathtt{65}}{\mathtt{\,\small\textbf+\,}}{\mathtt{20}}{\mathtt{\,\small\textbf+\,}}{\mathtt{25}} = {\mathtt{110}}$$
divide this all by what is outside the parentheses
$${\frac{{\mathtt{110}}}{{\mathtt{5}}}} = {\mathtt{22}}$$
do the inner most parentheses first
$${\mathtt{30}}{\mathtt{\,\small\textbf+\,}}{\mathtt{35}} = {\mathtt{65}}$$
then add everything in the outer more parentheses together
$${\mathtt{65}}{\mathtt{\,\small\textbf+\,}}{\mathtt{20}}{\mathtt{\,\small\textbf+\,}}{\mathtt{25}} = {\mathtt{110}}$$
divide this all by what is outside the parentheses
$${\frac{{\mathtt{110}}}{{\mathtt{5}}}} = {\mathtt{22}}$$
