$$\frac{2}{6}+\frac{2}{5}+\frac{4}{6}+\frac{6}{8}$$
$\frac{43}{20}=2.15$
$$\frac{1}{3}+\frac{2}{5}+\frac{4}{6}+\frac{6}{8}$$
$$\frac{5}{15}+\frac{6}{15}+\frac{4}{6}+\frac{6}{8}$$
$$\frac{5+6}{15}+\frac{4}{6}+\frac{6}{8}$$
$$\frac{11}{15}+\frac{4}{6}+\frac{6}{8}$$
$$\frac{11}{15}+\frac{2}{3}+\frac{6}{8}$$
$$\frac{11}{15}+\frac{10}{15}+\frac{6}{8}$$
$$\frac{11+10}{15}+\frac{6}{8}$$
$$\frac{21}{15}+\frac{6}{8}$$
$$\frac{7}{5}+\frac{6}{8}$$
$$\frac{7}{5}+\frac{3}{4}$$
$$\frac{28}{20}+\frac{15}{20}$$
$$\frac{28+15}{20}$$
$$\frac{43}{20}$$
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$\frac{43}{2 ^ {2} \cdot 5} = 2\frac{3}{20} = 2.15$
