$$\left. \begin{array} { l } { \{ 25 \times 16 \div ( 60 \div 15 ) - 4 \times ( 77 - 62 ) \} \div ( 20 \times 6 \div 3 ) } \\ { [ 16 \div \{ 42 - 38 + 2 \} ] 12 \div ( 24 \div 6 ) \times 2 + 4 } \end{array} \right.$$
$1,\ 20$
