$$3 \frac { 1 } { 5 } + 1 \frac { 7 } { 8 } + \frac { 5 } { 20 }$$
$\frac{213}{40}=5.325$
$$\frac{15+1}{5}+\frac{1\times 8+7}{8}+\frac{5}{20}$$
$$\frac{16}{5}+\frac{1\times 8+7}{8}+\frac{5}{20}$$
$$\frac{16}{5}+\frac{8+7}{8}+\frac{5}{20}$$
$$\frac{16}{5}+\frac{15}{8}+\frac{5}{20}$$
$$\frac{128}{40}+\frac{75}{40}+\frac{5}{20}$$
$$\frac{128+75}{40}+\frac{5}{20}$$
$$\frac{203}{40}+\frac{5}{20}$$
$$\frac{203}{40}+\frac{1}{4}$$
$$\frac{203}{40}+\frac{10}{40}$$
$$\frac{203+10}{40}$$
$$\frac{213}{40}$$
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$\frac{3 \cdot 71}{2 ^ {3} \cdot 5} = 5\frac{13}{40} = 5.325$
