$$1\frac{7}{8}+2\frac{3}{5}+8\frac{3}{16}$$
$\frac{1013}{80}=12.6625$
$$\frac{8+7}{8}+\frac{2\times 5+3}{5}+\frac{8\times 16+3}{16}$$
$$\frac{15}{8}+\frac{2\times 5+3}{5}+\frac{8\times 16+3}{16}$$
$$\frac{15}{8}+\frac{10+3}{5}+\frac{8\times 16+3}{16}$$
$$\frac{15}{8}+\frac{13}{5}+\frac{8\times 16+3}{16}$$
$$\frac{75}{40}+\frac{104}{40}+\frac{8\times 16+3}{16}$$
$$\frac{75+104}{40}+\frac{8\times 16+3}{16}$$
$$\frac{179}{40}+\frac{8\times 16+3}{16}$$
$$\frac{179}{40}+\frac{128+3}{16}$$
$$\frac{179}{40}+\frac{131}{16}$$
$$\frac{358}{80}+\frac{655}{80}$$
$$\frac{358+655}{80}$$
$$\frac{1013}{80}$$
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$\frac{1013}{2 ^ {4} \cdot 5} = 12\frac{53}{80} = 12.6625$
