$$2\frac{4}{5}+1\frac{3}{10}+2\frac{1}{2}$$
$\frac{33}{5}=6.6$
$$\frac{10+4}{5}+\frac{1\times 10+3}{10}+\frac{2\times 2+1}{2}$$
$$\frac{14}{5}+\frac{1\times 10+3}{10}+\frac{2\times 2+1}{2}$$
$$\frac{14}{5}+\frac{10+3}{10}+\frac{2\times 2+1}{2}$$
$$\frac{14}{5}+\frac{13}{10}+\frac{2\times 2+1}{2}$$
$$\frac{28}{10}+\frac{13}{10}+\frac{2\times 2+1}{2}$$
$$\frac{28+13}{10}+\frac{2\times 2+1}{2}$$
$$\frac{41}{10}+\frac{2\times 2+1}{2}$$
$$\frac{41}{10}+\frac{4+1}{2}$$
$$\frac{41}{10}+\frac{5}{2}$$
$$\frac{41}{10}+\frac{25}{10}$$
$$\frac{41+25}{10}$$
$$\frac{66}{10}$$
$$\frac{33}{5}$$
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$\frac{3 \cdot 11}{5} = 6\frac{3}{5} = 6.6$
