$$1\frac{7}{8}+\frac{11}{8}+\frac{3}{8}$$
$\frac{29}{8}=3.625$
$$\frac{8+7}{8}+\frac{11}{8}+\frac{3}{8}$$
$$\frac{15}{8}+\frac{11}{8}+\frac{3}{8}$$
$$\frac{15+11}{8}+\frac{3}{8}$$
$$\frac{26}{8}+\frac{3}{8}$$
$$\frac{26+3}{8}$$
$$\frac{29}{8}$$
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$\frac{29}{2 ^ {3}} = 3\frac{5}{8} = 3.625$
