$$(24 \frac{ 3 }{ 8 } )- \{ ( \frac{ 3 }{ 4 } \times 20)-(8 \div \frac{ 4 }{ 5 } ) \}$$
$\frac{155}{8}=19.375$
$$\frac{192+3}{8}-\left(\frac{3}{4}\times 20-\frac{8}{\frac{4}{5}}\right)$$
$$\frac{195}{8}-\left(\frac{3}{4}\times 20-\frac{8}{\frac{4}{5}}\right)$$
$$\frac{195}{8}-\left(\frac{3\times 20}{4}-\frac{8}{\frac{4}{5}}\right)$$
$$\frac{195}{8}-\left(\frac{60}{4}-\frac{8}{\frac{4}{5}}\right)$$
$$\frac{195}{8}-\left(15-\frac{8}{\frac{4}{5}}\right)$$
$$\frac{195}{8}-\left(15-8\times \frac{5}{4}\right)$$
$$\frac{195}{8}-\left(15-\frac{8\times 5}{4}\right)$$
$$\frac{195}{8}-\left(15-\frac{40}{4}\right)$$
$$\frac{195}{8}-\left(15-10\right)$$
$$\frac{195}{8}-5$$
$$\frac{195}{8}-\frac{40}{8}$$
$$\frac{195-40}{8}$$
$$\frac{155}{8}$$
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$\frac{5 \cdot 31}{2 ^ {3}} = 19\frac{3}{8} = 19.375$
