$$H=(\frac{2}{8}-\frac{3}{15})\div\frac{3}{10}$$
$H=\frac{1}{6}\approx 0.166666667$
$$H=\frac{\frac{1}{4}-\frac{3}{15}}{\frac{3}{10}}$$
$$H=\frac{\frac{1}{4}-\frac{1}{5}}{\frac{3}{10}}$$
$$H=\frac{\frac{5}{20}-\frac{4}{20}}{\frac{3}{10}}$$
$$H=\frac{\frac{5-4}{20}}{\frac{3}{10}}$$
$$H=\frac{\frac{1}{20}}{\frac{3}{10}}$$
$$H=\frac{1}{20}\times \frac{10}{3}$$
$$H=\frac{1\times 10}{20\times 3}$$
$$H=\frac{10}{60}$$
$$H=\frac{1}{6}$$
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$H≔\frac{1}{6}$
