$$\frac{1}{2}+\frac{7}{10}+\frac{1}{5}+\frac{1}{2}$$
$\frac{19}{10}=1.9$
$$\frac{5}{10}+\frac{7}{10}+\frac{1}{5}+\frac{1}{2}$$
$$\frac{5+7}{10}+\frac{1}{5}+\frac{1}{2}$$
$$\frac{12}{10}+\frac{1}{5}+\frac{1}{2}$$
$$\frac{6}{5}+\frac{1}{5}+\frac{1}{2}$$
$$\frac{6+1}{5}+\frac{1}{2}$$
$$\frac{7}{5}+\frac{1}{2}$$
$$\frac{14}{10}+\frac{5}{10}$$
$$\frac{14+5}{10}$$
$$\frac{19}{10}$$
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$\frac{19}{2 \cdot 5} = 1\frac{9}{10} = 1.9$
