$$2 \frac { 1 } { 5 } + 3 \frac { 2 } { 5 } + 6 \frac { 6 } { 5 }$$
$\frac{64}{5}=12.8$
$$\frac{10+1}{5}+\frac{3\times 5+2}{5}+\frac{6\times 5+6}{5}$$
$$\frac{11}{5}+\frac{3\times 5+2}{5}+\frac{6\times 5+6}{5}$$
$$\frac{11}{5}+\frac{15+2}{5}+\frac{6\times 5+6}{5}$$
$$\frac{11}{5}+\frac{17}{5}+\frac{6\times 5+6}{5}$$
$$\frac{11+17}{5}+\frac{6\times 5+6}{5}$$
$$\frac{28}{5}+\frac{6\times 5+6}{5}$$
$$\frac{28}{5}+\frac{30+6}{5}$$
$$\frac{28}{5}+\frac{36}{5}$$
$$\frac{28+36}{5}$$
$$\frac{64}{5}$$
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$\frac{2 ^ {6}}{5} = 12\frac{4}{5} = 12.8$
