$$5\times\frac{3}{20}\times\frac{2}{15}$$
$\frac{1}{10}=0.1$
$$\frac{5\times 3}{20}\times \frac{2}{15}$$
$$\frac{15}{20}\times \frac{2}{15}$$
$$\frac{3}{4}\times \frac{2}{15}$$
$$\frac{3\times 2}{4\times 15}$$
$$\frac{6}{60}$$
$$\frac{1}{10}$$
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$\frac{1}{2 \cdot 5} = 0.1$